It’s an odd thing; the concept of the homeowner grant is that it encourages single family dwelling ownership. Start doing anything else with the land, and goodbye grant.
This does mean that rental properties don’t get the grant, which means home ownership is artificially deflated compared to renting (because those taxation costs are passed on to the renter).
We seem to have moved past the point where we’re encouraging single family home ownership though, and are now trying to get landholders in many places to provide ANY increased home availability.
So I guess the real question becomes: are we still trying to move people towards home ownership, or are we content with somehow forcing landholders to provide enough homes for all the people, even if that’s via exorbitant rents that prevent people from saving for land of their own?