I ride on pavement almost all of the time, 90% bike paths. If I were riding to work, I'd feel different, but I bike for fun and a fatbike on pavement is less fun for me.

I have a 26" Walmart fatbike, that I converted to electric with your tyoical 750W Bafang rear motor, Got plenty of power. I've upgraded everything but the frame. Switched to quiet Veeco smooth tread tires because the knobbies would howl and announce my coming from far away. Shifts well. It's a nice ride, but a lighter bike just feels better to me, so this one has gotten less and less seat time every year since I first out it together (2016).

It's all subjective of course.

The other disadvantage is transport. I visit a buddy who likes on a beach and I've love to take this bike up there, but we will ride miles and miles on the county roads up there, and maybe do 20 minutes on the beach, and I'd rather have my lighter bikes with us, plus the fattire wouldn't even fit om my platform rack. That would be another $250 for a rack I'd only use once a year.