What I mean when I write 'clean and fully featured' is: a console, tabs, a nice scroll buffer, working escape sequences, suppressing the bell. That's about it.
This is 1000x less features than ConEmu - I don't care about a new exciting way to set terminal variables, or integration with a file manager nobody uses, or support for a bitmap font format, or per-app antialiasing settings. Or various silly extras the other terminals add - I don't want a new way to do Unix on Windows, I don't want a new SSH client this isn't as good as openssh, I don't want a new windowing system.
I'm suggesting EXACTLY something like notepad.
Do 1000x less things, and do the remainder well.
> I'd argue those problems are easier to rectify than for MS to develop yet another alternative
Just add tabs to the console app as suggested. Or use whatever Edge uses for window chrome and shove the console app in there rather than html.