Can confirm that my MBP 14" 2021 M1 Pro which had its logic board replaced would crash, go into a reboot loop, and got bricked after upgrading to macOS 12.3.
Brought it to Apple because I thought their repair was faulty, but they fixed it by downgrading the OS.
I haven't tried upgrading to 12.3.1 yet, even though there are successful reports. I might wait until 12.3.2 to be safe.
As for the reason why so many logic boards are being replaced. Any damage to the computer (e.g. liquid spill) will affect the logic board because everything is so tightly integrated onto the board such that you can't replace individual parts. The Touch ID board, battery, fans, vent module, display, lid sensor, and case are examples of separate parts. But if any part of the logic board is damaged, gotta replace the whole thing and probably some of the other parts near it too.
Edit: Decided to upgrade to 12.3.1 since I have a backup MBP. It worked - no issues so far!