Japanese stuff in general tends to get less attention here.
I would like to see the chart with Japanese games filtered out as well.
If I had to guess it's because its mostly RPGM games that use 2d.
Those might be contributing factors, but I redid the chart for Renpy Only, which means it's not including RPG Maker games or Japanese Games. Japanese games don't use Renpy. And it's the same general trend.
I also changed it to be sorted by views to get an even more accurate picture of what getting the most attention on F95. So much counting, which is required because many games don't tag themselves correctly. I probably won't do any more, but I learned something today lol.
Frankly, 2D art also requires way more skill... 2D games usually have less art and smaller updates.
This has got to be the main big factor. There are many games where you can tell the Dev has been drawing for years, but still isn't good enough to make it work.
The upside to 2D art over 3D is that it's usually more distinct and stylized (more memorable) and it's much easier to make 2D animations look good compared to 3D animations.
This is probably why we think of 2D games as being more popular than they are, because it's easy to remember the successful 2D games and the successful 3D games all blur into each other.
Still there are very successful 2D games, that are just as successful as the most successful 3D games, it just requires incredible skill, requiring many many years of practice, to produce high enough quantity and quality of 2D art needed for that level of success. Summertime saga creator was a professional background artists, and surely practice drawing characters for many years on his own before starting out, for example.
Mastering Daz3D art will take many hours, but not as long as mastering 2D digital art. Mastering Blender (creating 3D art from scratch), might take as long as 2D and would get even less attention generally, and takes pretty much as long as 2D to create things from scratch, but not many people do that, I don't recommend this path as some one who's dumped hundreds of hours into blender to become fairly skilled.