Most of my friends at FAANG all do their work on servers remotely. Remote edit, remote build. The builds happen in giant networked cloud builders, 100s to 1000s per build. Giving them a faster local machine would do almost nothing because they don't do anything local.
...and this is a great setup.
On the laptop you need: - low weight so you can easily take it with you to work elsewhere - excellent screen/GPU - multiple large connected screens - plenty of memory - great keyboard/pointer device
Also: great chair
Frankly, what would be really great is a Mac Vision Pro fully customised as a workstation.