Yes this is indeed exactly why I moved from Mac to KDE and why I donate to them. They still understand that in this day and age of opinionated design. I have KDE very heavily customised, but the cool thing is that unlike Gnome I didn't have to use a single plugin to do it (which always causes issues upgrading). Everything I wanted to change was available as a setting somewere.
And yeah I use Konsole, it's great! <3
MacOS wasn't so bad in the beginning, it used to be a Unix with good UI, but over the years Apple has been very busy replacing extensive settings with annoying on/off sliders (or nothing at all). Especially on macOS Server (if that's still a thing).
You probably don't need iTerm because the KDE (and the Gnome tbh) consoles are so much better than the built-ins that come with Mac and Windows.