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I suspect that while landing you really want the engine in "neutral" so you can at any moment kick it into full power if some issue shows up. Landing is damn close to a controlled crash.

And i don't think these kinds of aircrafts have the wing surface etc to be floating around on thermals.

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Usually when landing you want something like 110% of your stall speed, which means that you're not "crashing" (by which I mean stalling). This involves some sort of engine power.

I am not aware of any plane that lands without power outside of an emergency.

Staying above stall speed in a descent does not require any power. It is extremely common to perform a "power off" landing in a small plane, and these are often not in emergency cases.

Apart from all those thousands of sailplanes people fly every week. They land without power, and very few of those landings would be an emergency.

Yeah that is correct, I was more thinking of commercial flights rather than sailplanes/gliders

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