it’s nowhere near that simplistic.
The dealer service rep, mech & s/m are your first interaction. You make a negative or average impression there, you lose an opportunity for their advocacy on your behalf. Obviously, if you are towed in, rod through the block and a 300 shot of N2O hooked up, don’t abuse your relationship with the service staff. You know you did that one. OTOH, it’s not unrealistic to ask the service staff to not pre-judge the cause of failure. And sure, the mfgr. will make the final decision, but it will be with input from the service staff.