You can simply dump everything into a single collection, use basic 'front' and 'back' cards...and review. Yes, it may not be 'optimal' depending on how you mark cards, but for most people, it's good enough. Better than nothing, and probably an improvement as an addition to whatever they are currently doing.
If you want expert features, you can. You can drill, tag, organise, create different templates....but none of that is really necessary, or particulary pushed on you as something you should or have to use.
This is a common complaint, but feels like a "delicate flower" argument. The UX is pretty spartan, but a fancy whiz bang UI isn't necessary to remember facts.
Not everyone needs all that, and the people that do (which is fine, btw), is a reflection of the person more than the tool.
I mean, sure, if that's your thing and you enjoy it, go for it. But it is not necessary, and (SM2 vs FSRS arguments aside), it works right out of the box with the default settings and algorithm.
Like anything, trying to get that last 10% optimization is WAY more work than getting the first 90%. But "using Anki" (in any way) is such a multiplier over NOT using it that just taking that step is enormous.
Anki's data model is rather strange, which partly relates to its flexibility but has some unexpected downsides and trap-doors. I would love a slightly more opinionated SRS tool! (Maybe with a bit more UI polish, rather than rewriting the backend in Rust)