The sad reality is that we are going to see more and more printer companies building up walled gardens. There is money in models and the end goal is going to be one model site per slicer per manufacturer. There will still be the open source build your own printers but... there is a reason everyone recommended a Bambu over one of those.
As of right now? Qidi are pretty awesome in the semi-proprietary space and have a good track record of releasing the g-code macros required to interface with their printers (e.g. chamber temperature controls). Time will tell what they do with their multi-material solution though.