Fair enough, just my personal experience. I still own a Mega Drive, SNES, N64 and Saturn, and the cartridge slots on all of them are temperamental, it often takes a few in/out attempts to get the cartridge to be recognised. I also still own a Saturn and Mega CD, both still working just fine on their original lasers.
All I can advise is to clean everything. You dont have to clean the contacts on the slot all the time but at least every once and awhile. When you buy a new game regardless if it's mint, clean the contacts with a q-tip, rubbing alcohol, and some deoxit. Shit goes a long way. Also keep one of those air can dusters around. Dust off as much dirt or whatever crap as you can.
Also, avoid those aftermarket adapters if you could. Those MVS to Aes converters, I'm not a big fan of. I had a super converter which put a ton of stress of my cartridge slot.
Finch has a issue with his cart alot but the issue he has I dont think happens too often. I've had so many Aes and MVS units past through my hands and they got a shitload of play and never had a issue with the cart slots.
Some of those arcade mobos were sitting inside rat and roach invested Arcades for over two decades with games in the slots and are still going strong.
You really can't do anything about failing chips inside a console. That shit just happens just how chips fail inside a cart but regular maintenance is so important in this hobby.