Having owned 5 or so cars with assisted/smart/lane centering, fsd, etc. and they are wildly different. I had an Infiniti about 10 years ago that was surprisingly good but it would get freaked out by the salt lines the DOT put out before a storm. My Kia has great lane centering but it's intelligent cruise even at its most aggressive setting, is not aggressive enough. The BMW I had was decent but if the sun hit the cameras at a certain angle, it would be disabled. I've probably driven 20k miles using these cruise systems and I've never felt unsafe. They will sometimes get the lanes mixed up and you have to guide them, which is no big deal. The big problem with most of these systems are that they'll never improve. I'll never buy another car that can't be patched/improved ota.
All of those are a lot different than what Tesla is building. My wife has said that she's been happy overall with FSD, but is unnerving sitting in a semis blind spots, which it seems to do. I've never tried the older version but people are saying that the difference between v11 and v12 is huge, which is encouraging. Irregardless if whether you like Tesla, Musk, using self driving, etc. everyone should root for it's advancement. It will save tens of thousands of lives in the u.s. per year, help traffic, save insurance costs, etc.
Just saw a commercial for Mercedes drive pilot. "You can take your eyes off the road and your hands off the wheel" . Mercedes has been the leader in safety forever, so I'm happy to hear they are stepping up. Now they need to make their EV's more attractive.