Kairos

Is this not a solved problem?

No

Hmmm. I guess.

That too

The solution to which is broadband competition.

https://support.microsoft.com/en-gb/topic/the-welcome-screen-may-be-displayed-for-30-seconds-during-the-logon-process-after-you-set-a-solid-color-as-the-desktop-background-in-windows-7-or-in-windows-server-2008-r2-b4565ced-703a-cc85-bf9c-6b3d586d6421

Not necessarily. Programmers are heavily influenced by the language they use. There’s a reason there’s so many JS frameworks.

edited my comment to include the excruciatingly obvious assumption.

Because only JS is able to do that in a web browser. Everything else is just a dependency tree.

Incorrect. They can already do that without more money.

Use it anyway.