Are we all talking about the same scenario.
The OP is changing out an evaporator coil which I assume is because of a refrigerant leak. Nothing was suggested that there was any problems with system running properly so there is no reason to suspect any internal problems with the system at this time. You wouldn't suggest changing the dryer inside the condenser if you had a bad capacitor while you were on the job if it didn't show any problematic symptoms. So why would you expect any problems with it just because you're working outside the condenser? I could see if you want to change the factory 5cu. in dryer & put a 16cu. in. instead for more protection against moisture but to do it because the existing dryer might be bad doesn't make sense to me.