Sufficient pressure is actually exactly the problem, but it shouldn't be necessary to think about that. I'm just saying, intuitively, could you imagine pumping

Sufficient pressure is actually exactly the problem, but it shouldn't be necessary to think about that. I'm just saying, intuitively, could you imagine pumping steam through condensing coils and the water around it boiling as a result? Like say you're boiling some water on the stove and steam is rising out of it. If you held a cup of water in that steam, how much steam would it take to boil that cup of water? Keep in mind water vapor is lighter than dry air of the same temperature; it takes up about 2000x as much volume as the same mass of liquid water. The vast majority of the steam that goes into a practical condensing coil will come right out the other side, only a tiny amount of the steam that's in very close proximity to the surface of the coil will actually condense, which like, if you imagine steam going into a curly metal pipe immersed in water, I'd hope it's intuitive that tons of steam would make it out. You'd need crazy long and thin pipes, crazy high pressure, and crazy pipe configurations so there's way more steam surface area than water being heated, in order to boil water with the equivalent amount of steam. There's other tradeoffs here, of course. Both solar panels and reverse osmosis machines are expensive, they're like fancy machined semiconductors and ceramics and stuff, whereas an evaporator is some metal pipes and tanks and maybe some glass or mirrors, so depending on application they may be much more cost effective. But in terms of efficiency, there's no comparison.