Most of what you say is useful common sense, but the bit about not bothering with manpages is plain evil. If anything, the man page must be written before the program interface!
Also, more and more tools are cross platform and man pages aren’t a thing on windows (are they?).
Under vim's default configuration, manpages are a single keypress away. If you press "K", vim opens a window with the manpage of the word under the cursor. It happens instantaneously, and it uses the same font and color scheme than your code. I would really hate it if it opened a browser!
You should take your own description of your beliefs as a red flag to reassess them.
I use a few tools that don’t have man pages and I always find it jarring that I have to leave the CLI to get some basic usage info.
There is already tooling to generate manages and online/html docs from a single source. Reasonable thing seems to be “do both”. I’m not persuaded by “Windows is leaking.”
What, and ... what?