Are there any front ends as slick as the stock roku / apple tv / shield etc.. these days?

I'm bored, I have lots of spare hardware of various grades kicking around.

I have a big NAS w/ plex.

but.. more importantly, I have a family that isn't going to deal well with having to pat their head while rubbing their belly and turning themselves counterclockwise at 2rpm in order to access Netflix, Prime, Britbox, Plex etc..

They're all used to Roku thats built into the TV.. its easy.. it works (mostly) except not always great with Plex..

I've poked around with Kodi before but it looks like many of the services are that whole "well it works this week.. and if the company updates the service, maybe some volunteers will fix the app in a few weeks!" thing.. thats fine for enthusiasts.. less so for their wives.

So, all that rambled out.. any slick front-ends these days? I enjoyed good old WMC back in the day.