It seems that CRM Online does get quite a few more updates than the OnPremises version.
I understand that functionality updates might be slower, but at least give us regular bugfix updates? It has been 6 months since the last CRM 2016 On Premises update... CRM Online had 2 Service updates since then. (and if I read the list of fixes, it looks like they are applicable to On Premises as well, there is at least one in there that we would need)