Where ever you're putting the TV you have to put in regular power anyways, so it's fairly tidy to just put the device's power cable parallel with the TV's power cable. WiFi will handle communication. On the other hand, NEC and CEC requires minimum of 2 inches gap for communication wiring to electrical so you're now you've got that minor complication.
POE makes sense mostly when it makes sense to combine communication and power cabling. Corded phones, wifi access points, security cameras, small touch screen modules, etc. Not saying what you're doing can't work, but the added expense of installing parallel CAT6 everywhere doesn't seem worth it.
Mikrotik website has a good selection of them and if you look at the other hardware types it'll be interesting in getting an idea of weird things you don't see in normal offices.
https://mikrotik.com/products/group/switches
Apart from obviously larger bandwidth options like 28qfsp 100gb (I'm unaware if mikrotik does them but 400gb is normal in some circles) there's things like reverse POE switches, media converter switches, and all sfp+ switches.
Poe++ exists and you can use switches with it to power poe+ switches that will power poe switches. Or they can be used to power laptops or NUCS directly.
My standard campus switches are 722s with 48 ports and 25/10 SFPs, but there are use cases when smaller switches make sense.
> Oh, so you hate waffles?
What does enterprise grade mean to you?
That being said, a quick Google search for "poe usbc" yields some devices that are much more expensive than the power brick I bought, but in theory would let you run a Chromecast from a poe ethernet port with wired ethernet.
Can you expand on "often, but not always, power"? Here's my guess:
* It's more efficient for the small stuff: little wall warts aren't very efficient I think in part because there's some no-load consumption for each. The switch pays that no-load cost once for many devices and has like an 80-plus gold or better PSU, hopefully. And then I think even cheap buck converters are like 95% efficient; they have some no-load consumption too but I think less than the wall warts? And even though this goes over 2 (or 4) tiny wires, at 48V–56V, the current is low enough that power loss is not bad because those wires are just for one small device, and P=I^2R.
* It's less efficient for the big stuff: that P=I^2R starts to suck for the PoE case, and in the non-PoE case they're more likely to have efficient AC->DC conversion on their own. 90% efficient beats 90% * 95% efficient.
If you have one small PoE device connected to a large PoE switch then it would be less efficient compared to a non-PoE switch and a small separate power supply for the device.
I ended up buying a PoE extractor and barrel plug adapter for my Roku, and another extractor for my HDHomeRun.
It annoyed the heck out of me that they had PoE running to them and still had to be plugged into a separate transformer.
Ubiquiti did this for a while, the product line was called UniFi LED and IIRC it didn't get much further than a few panel lights intended for drop ceilings and a wall mount dimmer switch.
IIRC the justification was that because it was low voltage it could be installed by anyone instead of potentially requiring an electrician and you then also got the ability to dynamically adjust grouping, switch behaviors, etc. if for example your floorplan changed.
In their consumer "UniFi" product line. Pull up their store and switch over to the "UISP" product line. Most of the smaller wireless devices and consumer-tier CPE are 24v passive, most of the larger wireless devices, 60GHz bridges, etc. are 48v passive, a few devices in the middle support both, and standard "active" PoE is almost nowhere to be found. Even on product lines that weren't even dreamed up when modern standard PoE was ubiquitous.
They say it's because the WISP crowd loves passive PoE as it can easily be wired to batteries on towers, and I get that, but that's no excuse for not also supporting standard-based PoE on the device end. There's no good reason for a product designed in the 2020s to force the installation of passive PoE where there was none prior.
They demonstrated they can do both with most of the transition-era UniFi products. Support and encourage the use of standards, allow the use of non-standard but common alternatives where they make sense.
A correctly-designed Ethernet interface is galvanically isolated at both ends to avoid ground loops, differing grounds, and other nasties over long distances.
For those thinking about adding one they've grabbed off amazon and installing themselves, please do a bit of hunting and reading rather than just buying the first word soup brand cheapest ones. Also remember installing uncertified electronics in your walls is a good way to void your insurance if they're the cause of disaster and turn it into a legal battle even if they're not.
I realize that for whatever unknown reason there are a subset of people who think everything should be wireless, but those people are wrong and should not be listened to.
Whenever possible, I opt for PoE. It’s a damn shame it’s limited to a niche userbase given its myriad advantages.