They even have the gall to call it an improved UI for reviewing large pull requests. They must have let UI designers who've never written code before design it.

IME those types of UI designers are way way way way more common, very few designers seem to understand the platform they are designing on and care more about aesthetics rather than proper platform designs.

That's what happens when the whole company uses high-end macbooks and nobody has an older PC. It's been noted thousands of times on HN but these US companies make money head over fist and do not give a single damn about people on "lower" end devices.

Large GitHub PRs are miserably slow even with a maxed out Mac Studio on gigabit fiber with single-digit ms ping to their server. It’s not an example of something that works well on high-end hardware but scales down poorly.