See I work in accessibility. Like I provide and create solutions direct to end users with complex needs. Not regular web accessibility. I get the view of this. It’s the same idea of universal access. But actually I don’t fully agree. Yes. If you can stick to this principle - and do try / but I promise you edge cases - which in itself is what accessibility users are all about - cause headaches. At some level you have to do custom stuff. It’s the best way. Take for example switch users. Yes. If your ui is tab able - great. But what if you need your items scannable in frequency order. Your tab index needs to change to meet the end users needs. Or eye gaze users. The accuracy level changes. Add in cognitive issues. You can’t just make a one size fits all interface. At some stage you need to significantly customize it. You can’t rely on a user just learning a complex system level interaction technique- if they can’t do that you have to customise on an individual level.