Oh, absolutely. I maintain the engine for my video game and it's ultra-minimal tailored to my needs. That leads to better performance, and a much slimmer build size. (currently sitting at ~900KB for the optimized build of a nontrivial game, assets bundled separately). It's also a better development experience, imo.

My argument was mainly about these more generalized engines, like raylib, 'Tramway', or Source.