Heatsinks optimized for radiative cooling, which are kept in the shade by solar panels. Works much better when half or more of your surroundings aren't a planet at human-scale temperatures, as is the case on earth's surface.
only because of very constrained weight budget (which is constrained by the high price of delivery into space) so you can't just throw in an AC with a radiator. The radiative power scales with the 4th of T, so it is pretty effective in space if you run the hot end of AC hot.
I suppose there were a lot of arguments about usability and various constrains/impossibilities 30+ years ago when cell phones only appeared at $1+/minute and were available only at a very few places. Yet here we are. The cheap access to space will do the same for various tech-in-space (how about unlimited access to space with fineprinted "cap of 1000kg/month" :).