I’m guessing it’s mostly driven by people renting tiny bedsits where the only cooking facilities they’d normally have room for are a microwave and a kettle. The fad seemed to blow up during the pandemic when everyone’s nearby restaurants were shut, so they’d have to live on instant meals and pot noodles. Be a game changer for those folks.

It’s probably cheaper to run than a regular fan oven because it’s heating less space. Otherwise yeah, it’s just a small oven.