I don't know the MEL/DDG by heart to remember which single channel faults can affect dispatch for the next sector, but if any does then it's good to know. You might be going to a regional destination where you have no tech support and you would be stuck there. It's better to get the info you need and make an informed diversion.
I once experienced a pressurization controller fault during the descent into an airport where we had no maintenance support and we diverted to our main base. Had we landed, we would have been stuck there for the night.