I've had good experience with the Trade-In WHEN you follow the instructions for the item being traded. Make 1 mistake and the device will not be accepted, this I learned after the fact once and I was so angry with MYSELF for not following the Trade-In instructions
I'm also tempted to trade in my S21 Ultra for the new S22 Ultra. From what I've read, the cameras will basically remain the same but with some nice little updates... like glare free lenses and better/faster sensors. Then looking forward to the larger storage capacity and for sure the built in S-Pen has me excited.
I really wish they would add back the darn micro-SD card slot!
I know I'm late replying to this, but don't visit this site very often. Anyway... crucial is an understatement. Having this feature and your phone dies it's a life saver. Now without it... you're literally screwed unless you're the type (which I'm not) to use cloud back-up.