OrCAD - How many updates / hotfixes usually on annual basis?
As comparison, Altium has released 15+ updates for version 20, and two times less for version 19.
They do a new release each and every year now.
In 2 years I was on maintenance subscription, they were rolling out "Quarterly Incremental Releases" every, well, quarter, also there were bugfix/maintenance releases in between QIRs which were more often, but I can't remember by now exactly how often they were.
Over my time on a sub, they basically re-implemented 3D view engine from scratch, and added a fair bit of functionality in it like ability to move parts right in 3D view which will back-propagate to the layout, or collision detection, cutout views. Also in one of QIRs they've enabled some features to Professional license which were previously only available at higher licenses (things like impedance and crosstalk visions, via z-height, dynamic phase matching for diff pairs, etc).
So I think if you use OrCad professionally and can afford it, I would say maintenance subs are worth their money.