Slack: It refuses to accept that it is a webapp, so even though firefox fully supports the relevant audio/video api:s I need to open another browser or fiddle around with XWayland (electron/chrome does not support wayland) just to be able to use it.

Microsoft Teams: Same as above, but with multiple login prompts each time.

Jira/Confluence: I swear every click/hover requires a network roundtrip to the server because that's the only way it can be so sluggish. Also, 30s loading times.

Webpack/Babel/Parcel/WhateverJS: Either kill me or kill IE so I can stop using these tools to get even a moderately modern stack.