Not sure if "optimistic" is the right word - you could still do a lot with tiny memory or CPU footprint, but that's difficult to do if a large part of tech have adopted to either not care about the waste ("space is cheap"/ "the RAM would just sit there unused if I didn't use it") or lately even based technologies on the paradigm of using as much of it as possible. That was the explicit idea of bitcoin, but even AI development goes by the logic of "what would happen if we just made the model twice as large?"
The last iteration is "tokenmaxxing" where you try to spend as many tokens as possible first and then find out if it got you anything useful.
Minsky, in the 60s, thought that object detection / classification with a camera was worthy of a summer research project for undergrads. Maybe there is a classical algorithmic way to do so (I personally don't believe there is). But I would file that under optimism, since that problem realistically took massive amounts of data (PBs? XBs?) and Machine Learning to get decent at. IN the 60s I doubt there was enough compute in the world to solve that. Which is why I put it under optimism.