I don't think that whatever delay there is between the Ubuntu and corresponding ZorinOS releases is an issue. What I care about is having a system that is reliable, intuitive and easy to work with. I'm still fine with ZorinOS 16 so I'll stick to it for as long as I can. Once it becomes necessary, I'll re-evaluate my alternatives. Although I will probably install ZorinOS 17 for new machines.
Every one should evaluate their needs. Some people think they need the latest and greatest while they don't, it's just the FOMO syndrome kicking in. Others do actually need it, which is fine, there are other distributions that provide that.
I do wish the developers were more active in letting us know what's going on behind the scenes and of course, a faster development cycle, but I don't feel like I'm losing anything by not updating as often as I could.