It is confounding to us male players, since making the size of anything
smaller is a shockingly counterintuitive choice.
Seriously though, a lot probably has to do with (a) when & where a dev started learning to render and (b) how technically adept they are/were when they started. Availability of software and advanced hardware setups are probably both somewhat regionally influenced
in general, although if a fledgeling dev is well off financially it probably matters less. If they do have equally easy access to all different rendering options, how difficult they are to learn/operate effectively is likely another major factor. If they are rich with powerful hardware from the start
and have a lot of technical experience, then maybe it comes down to stylistic choice, but I doubt very many new devs have the hardware & know-how to be making aesthetic choices when they are getting started.
Related question for all posters: are there many well-known/productive devs who have changed from one renderer to another once getting established? I can't think of any off the top of my head, but I don't think I've played multiple games by the same dev more than a handful of times.