Let me point out a flaw in this thread:
As DRM is correctly described by the sources you found its sole purpose is to reduce the ammount of software piracy. (Whether the system under consideration is succesful at this is another question) As DRM as such does not offer any added feature to a software the possible reduction of software piracy is the only possible point on the pro list.
Other stuff that you might think that could go to the pro list ("Yay, I can install the thing on as many pcs as I want and I have my safegames always available! ...") have nothing to do with DRM but are instead part of a feature that UBI adds to SH5 and other future games and that could very well exist without DRM attached to it.
So there you go. One point on the plus side: Possible reduction of software piracy.
But since this is the only positive aspect that DRM could ever inflict, as time goes by people will surely be happy to give you a truckload of reasons why DRM and this DRM in particular is a bad decision. ... Come to think about it, by now you can actually click on any thread in the SH5 part of subsim and find plenty of points.
Edit: Well, as always too late. People already did put up the truckload.