That's why I've mentioned time to market. Take GitHub as an example: It's neither the fastest/most lightweight git hosting page (that would probably be Gogs/Gitea) nor the most feature-rich (GitLab is far more advanced, as far as I can tell). They are where they are because they've made a viable product first. Same with slack: Electron is not a good solution, but it was a desktop app in 5 minutes - can't beat that.

I'm not trying to say performance doesn't matter - I'm using lower-powered devices myself - but development time is also a big factor for b2c.