More than decade ago, in 2011, my father had Galaxy S2 and I had Galaxy Nexus. Hardware-wise, they were comparable (Galaxy Nexus was something like Galaxy S2.1), but the former run TouchWiz and the latter vanilla Android. The latter was much more snappy, the former's performance did degrade.
Now fast-forward almost a decode. I'm using Galaxy S10 since its introduction in 2019. TouchWiz is nowhere to be found. Samsung uses OneUI nowadays, which is actually pretty cool, and I prefer it to vanilla Android. Basically, I have as good experience with it, as you described.
Now fast-forward almost a decode. I'm using Galaxy S10 since its introduction in 2019. TouchWiz is nowhere to be found. Samsung uses OneUI nowadays, which is actually pretty cool, and I prefer it to vanilla Android. Basically, I have as good experience with it, as you described.