Maybe they are hated by nerds on reddit and hackernews.
I gather most people are just using the apps and have no idea how they’re built.
They may have no idea how they are built, but they do notice how janky and out of place they are. Take for example Microsoft Teams, have you ever met anyone who actually likes that app? It's insane that a simple chat app uses well over a gigabyte of RAM.
It's absurd that one of the biggest software companies in the world can't seem to produce a sleek, native app. It's purely a cost saving measure. They decided mediocrity is good enough for them and they get away with it because the people making the purchase decisions are not the people who have to use it daily.
Because people who develop these only care about one thing: ease of development. They couldn't care less about what users say, and if they cared they wouldn't understand users, because users don't use terms like "latency", or "startup time", or "lag".
For their own operating system that they own the APIs and development tools for, no less!