Is it really, though? Just for kicks, last year I got an ibook g4 for a few dollars, and I got Minecraft running on it, not the absolute latest version, but one a few years old (Minecraft dropped 32 bit LWJGL support a bit ago). With some tweaking, I managed a solid 40-50 FPS, on what would have been a pretty anemic processor back in ... 2002, 2003?
Although, maybe it doesn't count as I used mods like Optifine, which are made to ... replace said un-optimized code, but I thought it was a good showing for Minecraft and the JVM anyway.
Minecraft itself it good enough for... pure Minecraft gamplay most of the time.
But it can overwhelm itself. There's a equipment called Elytra you can wear to slide down the air, and if you use Rocket when sliding, you gain a huge momentum boost.
If you keep boosting on a server, being fast enough to challenge the serverside world-loading, you can crash the server.
Another big defect is it's rendering is deeply tied to cpu time, and the game itself has limitation. My recent experience with a 200+ mods & shader setup is that with RTX3080TI (also better cpu) and GTX980TI it runs at same fps (20~30).
Although, maybe it doesn't count as I used mods like Optifine, which are made to ... replace said un-optimized code, but I thought it was a good showing for Minecraft and the JVM anyway.