[amatwl]

Dragon 2/ Crew Dragon originally was going to support propulsive landing, but nixed due to future architectural plans (making some of Dragon a bit of engineering dead-end versus Starship/ BFR) and complexities in certifying for NASA use.

The Soyuz fires retro-rockets just before landing in Kazakhstan to lessen the impact. Even with that, the landing is still pretty rough. Land landings are sometimes described as akin to a car crash - water landings are softer. I'm sure there's probably a contingency capability of being able to support a land landing for Crew Dragon in case of aborts.

Interesting history note: there was an actually a concern during some of the early Apollo flights (I'm specifically thinking of Apollo 7) of land landings during an abort. Apollo 7 used a Block II version of the Command Module, however the crew couches were still the Block I variant. There was evidence showing the couches wouldn't perform well during a land landing. The concern was that if the LES was used, winds could force the capsule to a land landing. The resolution was that wind speed was a factor in a GO decision for launch.

It's interesting to note that Starliner is planned to perform land landings (using airbags). Land landings for capsules have been worked on since the 60s with the Gemini initially having plans for a Rogallo wing (https://en.wikipedia.org/wiki/Rogallo_wing#/media/File:Gemin...). There were even plans for re-use of the Gemini capsule! Water landings quickly ended that discussion, since salt water is pretty terrible and corrosive.

[billfruit]

Water landings have their peculiar risks also, I think there was some incident in Mercury program when Gus Grissom's craft got flooded after splashdown.