Yeah... as much as I tend to dislike Apple and their decisions, this is a complaint I don't really understand... especially since the M1 with Rosetta 2 supposedly runs software better than the Intel macs did anyway! I actually chalk this up to the weird fetish people who use Apple products tend to have with things being exactly "modern" as opposed to being stable and functional or even performant (which tends to lead them to pester people to upgrade to new things on the Apple treadmill constantly rather than support new features or use cases... Windows and Android users don't do this and I frankly think are much better off--both professionally and psychologically--because of it). Put elsewise: Apple did do the work of porting homebrew... by writing Rosetta 2, and they probably tested it on Homebrew internally to make sure it was compatible with lots of Homebrew packages.

Yes. And it has worked perfectly for me so far, as if I was still using brew on an Intel mac. People complaining that they can't do development on an M1 mac because of the lack of homebrew support either don't realize you can simply run it under Rosetta, or are just complaining for the sake of it.

Yes, I just did last night (to install youTube-dl in fact).

You do have to specify Terminal to launch using Rosetta however.