Yea 100% it’s not as easy to use. But as far as I’m aware Steam doesn’t provide any guarantee games will keep working and GOG actually has it as a mission statement that, as least those selected as “Good Old Games”, will[0]. Now of course that requires GOG to survive so it’s sorta the same thing like you’re saying.

But I’d argue there is a material difference between “if you try hard you can run an original copy of Doom” and “if business X decided so you can never access those things again”.

0: https://www.gog.com/en/gog-preservation-program