I only choose to buy hardware that I can connect to Home Assistant, because I can still use it if the company goes bust or no longer supports it. I have one dashboard in HA that manages all my different devices. Point is, I still buy the hardware and the sale is made. I’m not going to buy 5 different standard products which must all be managed through separate apps. Open standards can open up to a much bigger market. There is good reason why so many OEMs opened up to the Matter protocol.
But as I say, I check first for compatibility, then I narrow my choices from there. So yes, right now your company’s IOT product won’t get onto my radar. Been there, done that, and got a handful of dead paperweights to show for it.
Could be yes - although I seem to think with my transfer from one Samsung to another it brought the files and settings over. Can’t remember for sure now as was over a year ago, but I did not recall any major issue.