Passive cooling could be enough. Even a bunch of ssd chips wouldn’t take up all of the vertical space, so top of the case could just be a heat sink. Though it might need instructions to only install it in an enclosure that has a fan blowing air past it (and not use the spots behind the mobo that don’t get much airflow).
A lot of motherboards come with metal styling that acts as a heat sink for nvme drives without even using fins, though they still have more surface area than a 3.5" drive and only have to deal with the heat from one or two chips.
But maybe it isn’t realistic and that’s why we don’t see SSDs like that on the market (in addition to price).
Yeah, I’ve wondered if the ones that come with heat sinks really need them or if it’s just a gimmick to make people think the performance is better.
I want one of those heat cameras some use in hardware reviews. I don’t need one, but Iwant one lol.