Samsung technicians never pay attention to precision. Had pretty bad experiences with them a few times. Counting from forgetting to fit vital screws to damaging parts is a regular activity by them. Service centers from OnePlus get the repairing done in front of customers - that's how their cabins are designed as my my experience. For Samsung it's the complete opposite.
....
Update:
Instead of taking the ADLD route, I decided to personally visit service center because of old learnt lessons (nothing to do with ADLD, but a good sum of repair cost should be compensated "corporate way" via a family member).
Visited service center's manager is known to me and what I discovered is, the concerned SC does not have an important tool - the automatic back panel separator machine that removes the back panel automatically using heat. It's required to remove the panel with precision, also helps greatly to keep the ingress protection intact despite of a repair which is
otherwise "hurt"(despite of using adhesive while assembling it after a repair) if removed manually with hand tools(like using the phone's metal frame as a support/lever using any hand tool to detach the back glass panel, thus getting micro-misaligned here and there). This info is never told to any customer. And after a repair, if the device is damaged due to water going in someday, it's not honored officially anyways because liquid damage is not covered under warranty.
To my surprise, none of the service centers I am capable of visit to, has this machine(enquired through the known service center manager himself) because,
1. S22 Ultra is relatively a "new device".
2. Service centers need to separately buy it from Samsung itself.
and the one that's available for S21 Ultra and some other phones is incompatible(he took me inside the service center and showed it). But most of these service centers are removing the back panel of S22U manually that the customers aren't aware of(as I said before, this info is never given to a customer seeking service) and also customers are satisfied too because "everything is working as intended".........until one day they discover water somehow went in "unknowingly" even under the slightest rain and damaged the phone. Win Win for service centers.
Time and effort put - not worth it, but I'll wait and see.