I'm actually curious what systems you're using. I have very limited experience, I have a M3 and a 21 Corolla with Toyota's version.
My M3 has never once just given up on the lanes and stopped steering, but it's a very common occurrence on the Toyota. It just gives up and suddenly you're back to controlling it with no real rhyme or reason to it that I can find.
I guess it comes down to preference. I see it as assistance. I want a helper who maybe can’t do it all, but never fucks up.
I've used Blue Cruise a good bit which supports hands-off modes. This system works very well on highways hands-free. It seems to want me to put my hands back on the wheel when approaching the toll gantries and goes back to hands-free a few seconds after the toll gantry, but otherwise I've been able to go well over 100 miles at a time without touching the wheel or brakes. I've never had any kind of phantom braking situation or slow downs, it works well in stop and go traffic, and has overall been a great experience.
If I want anything, I have a cellphone. It's impossible to compete with "put that UX through better speakers/mic/screen"
I recently bought an EV and a secondary concern (as in, not one of the primary concerns of size, range, charging speed, and price), was the control interface. I went with a model that has nearly all physical controls. Had the choice between otherwise equivalent vehicles been available, I'd have paid a non-trivial sum to get a button interface option.
From my Tesla-owning friends, I hear that their software is the "best", which seems to be like being the tallest dwarf. I literally can't imagine a pure software/touch interface being better than a physical button interface for the most important driving controls.
on my smart tv i use apple tv, and never their own ui. i trust apple for privacy and dont want to log in or configure 20 apps on my car. i want my iPhone and its features, period.
Their software is top notch compared to the mish-mash of home grown and Car Play on other vehicles. And the implementation of AutoSteer (free cut down version of self driving) is far superior to what I've seen in other cars.
I can see other automakers catching up in 2-3 years, but that is not the case right now.