Too many people have the "Premature optimization is the root of all evil" quote internalized to a degree they won't even think about any criticisms or suggestions.
And while they might be right concerning small stuff, this often piles up and in the end, because you choose several times not to optimize, your technology choices and architecture decisions add up to a bloated mess anyway that can't be salvaged.
Like, when you choose a web framework for a desktop app, install size, memory footprint, slower performance etc. might not matter looked at individually, but in the end it all might easily add up and your solution might just suck without much benefit to you. Pragmatism seems to be the hardest to learn for most developers and so many solutions get blown out of proportion instantly.