My Galaxy Fit 3 smart band connects without me needing to reset it, unlike S24U on UI7 which would require me to reset the smart band if I first registered it to another phone. Security wise I am not concerned, because it's connected to my Samsung account, otherwise, I would be concerned.
On an S23Ultra and haven't yet found any new features. Finding bugs battery life substantially degraded, magnifier widget, email synch and email security certificates. All reported to beta team.