Well, Minetest also can hardly be compared to Minecraft as Minetest is only an engine or platform for voxel based games like Minecraft. What you rather have to critique is something like Mineclonia that is apparently a more active fork of the MineClone2/VoxeLibre project that try to perfectly replicate Minecraft (without using Minecraft assets that is) on Minetest. Allegedly it’s pretty good now but I haven’t tried so myself. As already mentioned, the community for Minetest as a whole is pretty small and that additionally split among so many different games building on that. But it’s good that viable alternatives exist in case Microsoft ever considers shutting down the Java edition.
Edit: Typo
I created an account there an eternity ago when I first heard about them to reserve my username just in case but I will never consider a platform that cannot package their launcher/tool/software correctly and instead shoves a complex curl-to-bash script embedding binary data and a whole lot of other anti-pattern up my throat that is the least trustworthy and safest method of distributing your software.