Well, my UR44 can be compatible with all Steinberg products, but it shouldn’t be dependent on any of them. I don’t even think this is the case here. Because a major company like Steinberg should have proper resources and manpower to deal with all of their products at every level at the same time, let alone making a simple driver ready in time of a major release of a major operating system.
Unfortunately, the only logical explanation I can think of is they don’t have enough Mac users to force them care about their Mac support anymore. I can’t blame Mac users here. Since 2015 when I bought my first Mac and UR44 together, I haven’t seen a single Mac OSX release that wasn’t a big question mark for Steinberg products. They always seem to be uncertain about whether they will support Mac or not. Believe it or not, all other companies that I have products of (and they are not calculators either) released updates to their software way before Steinberg every time. So please bear with me if I don’t trust Steinberg more than a fictional company which supports their small fictional calculator app properly. 
In conclusion, although I find a month is too long to wait for a driver, I will have to wait for it. I can’t do anything about it other than showing my reaction over here. But am I sure that I am going to see a proper steady driver update instead of a discontinuation message by then? No, I can’t say that, because they can’t say that either. All I can do is crossing my fingers and survive this Mac OSX release yet again.