Universal print would be a lot more useful if it provided support for both Windows and macOS devices as many enterprises support both platforms.
More platforms (MacOS, ChromeOS) would be definitely beneficial. However, IPP on Mac presents some challenges - this is not IPP Infra, just plain old IPP.
If you are interested in Cloud Print Management, YSoft SafeQ Cloud (shameless employer promo 😉 supports MacOS cloud printing (without any 3rd party clients) alongside Universal Print B-).