I think they will probably never add support for other products. Literally everything out there is ASCOM compatible so they could’ve already easily added at least support for things that they don’t have a direct replacement for like rotators, flat panels, iPolar/Polemaster etc. I mean they added mounts that are not made ZWO so it must be at least a little perfect already 🤫
It could be that they want to maintain a “walled garden” like so many other companies out there or could be they don’t want to get bombarded by support requests for other products, or perhaps they want to create an ecosystem in which people have to purchase company-approved accessories only. All valid reasons I suppose.