The world could run on older hardware if software optimization was a priority

The priority should be safety, not speed. I prefer an e.g. slower browser or OS that isn't ridden with exploits and attack vectors.

Of course that doesn't mean everything should be done in JS and Electron as there's a lot of drawbacks to that. There exists a reasonable middle ground where you get e.g. memory safety but don't operate on layers upon layers of heavy abstraction and overhead.