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Something else that's worth noting is that in this form, as written, it seems like construct companions don't have the limitation about only using land speed when being ridden that animal companions do. I may be wrong about this (and of course it could change in the final version), but here's what I've got:
There doesn't actually seem to be a generic rule that says that animals in general can't use fly/climb/swim speeds when used as mounts. The rule is under animal companions, and notes that an animal companion being used as a mount is limited to only land speed and cannot use its support ability and move in the same turn, unless the companion has the "mount" trait. As far as I can tell, this seems to mean that if a character can get a large enough flying (or climbing or swimming or whatever) creature to be willing to act as a mount, that works. It just can't be an animal companion. Please correct me if I'm missing something, but I've looked in a few places and I can't find a more generic version of the limitation that animal companions suffer.
If I'm right about that, then the fact that construct companions don't have the language about being limited only to land speed when ridden means that they might have a niche as being very effective mounts with non-standard movement types.
Of course, this may all be an oversight on my part, or maybe it's an inadvertent bug in the rules that will get patched out in the final version. That said, I do think there's a good argument to be had that the problem Paizo was probably solving with the animal companion movement restriction (early "at will" access to climb/fly speeds for characters with certain types of animal companions) is already solved by the fact that the modifications to get climb/fly speeds are level-gated already.