The second paragraph of the first point is all about customizability.
It is certainly noticeable on machines without much memory, though I guess developer workstations have enough. For me even with everything booting Firefox or Waterfox on a PC is still noticeably slower than on Linux with a walmart laptop (natively and unsandboxed) and booting + login till the same number of apps/services start is quite faster on Linux.
Hmm, sure. I guess I conflated back-end development with managing.
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