They're currently up to date on all Nikon and Canon DSLR's and mirrorless cams, so... I dunno. They're iffy on supporting Pentax, and haven't supported Sony because Sony refuses to work with third party developers. There was a delay for a bit there, sure. But I've used my R5 and R6 with the AIR, and seen other people doing it...so traditional style cameras and accessories are most definitely part of the design intent. 1/4x20's a pretty common screw size for a of of astronomy stuff, anyhow. It is a little weird mixing metric with SAE, but eh.
I think most of the drive they have towards using their product is that there's no benefit to them to support other equipment. Trying to support cameras, focusers, etc from other manufacturers just costs them time a development cost, with no real gain. I highly, highly doubt they'd ever try to limit it to a zwo mount if they ever did develop one though. Not only would that make their existing customer base pretty mad, but it would also drastically, drastically lower their sales because the pool of people with a zwo mount would be ridiculously small in comparison.
As far as the dovetail goes, they're typically called synta dovetails.
I haven't seen an SAE screw on anything I've bought except for one cheap dovetail from svbony (which didn't come with screws), but my experience there is limited.
Maybe the post about someone complaining about support on their canon 6dxxx (where the x's were something I hadn't heard of) was old or something. But as I said, it's not that they don't support them, it's just certainly waaaay back on their to-do list.
That's basically what I was saying. If they ever create a mount, they're not going to remove the current support for mounts that are already on there, but stuff like when sky watcher changed the board in the eq6-r pro mount which required a patch on the asiair to get working again is going to take that same backseat on their to-do list. And I would guess it's for the reasons I stated and you reiterated, it doesn't really benefit them to do so until they believe they've sold all the asiair's (or whatever product) they can to the people using all of their stuff.
Thanks for that! Much better to have the actual name than keep calling it "really small vixen shoe/plate, like for guidescopes"