Nobody can know everything, but...

It's becoming the norm actually, lots of distro's do that by default or support it on their install/rescue media since it means they no longer need to build two separate userspaces, they just include two kernels to boot from on one disc, so for 99% of actual users there's only one specific disc image to download as a result.

Especially since a LOT of the time you _need_ a 32-bit userland to deal with a lot of binary packages out there or to get stuff running under WINE properly, it's easier for the "end user" images to stick to 32-bit userland even on 64-bit platforms. And even if you have a 64-bit userland you'll find it littered with various 32-bit-compat libraries.

Servers? Those are a different story, but many of those folks don't even need 32-bit compatibility so they can end up with a cruft-free pure-64-bit userland without all the 'compat' crap bolted in. So it reduces the size of the true-64-bit install media too, since there's no 32-bit cruft now.