Not really an enhancement.
I suggested this somewhere, IRC, -dev mailing list, not sure. Nor am I sure that it registered.
I seriously doubt anyone is running on 32-bit platforms any more. Even Raspberry-Pi is 64-bit now. Even Ceph has stopped supporting 32-bit with Nautilus/14.x.x.
But it's probably still worth continuing to build it on 32-bit in the CI just to keep people honest (and correct) about sprintf format strings and other 32-bit-isms.