Confusion about block size

[solskogen]

With rdbtool you can create hard drive images with larger block sizes than 512, but the documentation says that Amiga don't support that (and amiberry doesn't seem to like it either) - so why does the documentation say that "you may want to increase the block size to 1024, 2048, or 4096" when it also says "Amigas only support RDBs with a 512 byte block size!"