Originally Posted by
JVME
I had a mountain bike. I hated it. It combines all the things I do not want/need: suspension (Why? So my ride can be less efficient for the sake of something I don't need? Why add the weight, potential failure point(s), reduced efficiency and maintenance of something I have no use for?), I have zero access to trails and have no interest in going to them, taller wheels and geometry (so I can clear things I'll never encounter?), derailleur(s)/gears I don't want or need (see also suspension).
Of all possible options, mountain bike is at the bottom for me.
Hardtail or one with a rigid fork would still be better than a BMX bike for what you want to do. And they do make them available as single speed.
Something like this may work for you as well
https://spotbikes.com/products/acme-bike