A notable example I remember from around 2010 was when Evernote dropped WPF, supposedly due to blurry text issues but probably also performance (remember when we called it EverBloat?)

Can't find the original blog post about it but here's a couple mentions of it:

- https://www.edandersen.com/p/evernote-has-no-patience-drops-...

- https://www.reddit.com/r/csharp/comments/x0nu7h/comment/im9k...