Why do I think what? That it's limiting? Because it's true?
I guess my main thought experiment for the people who are seeing this simply as "Sony offering options" would be this;
Take the following three games; Audioshield, Job Simulator, and The Unspoken, and explain how they can be played on a Dualshock 4 without making massive sacrifices in the core game design (and more than that, how they can still be considered super fun games that someone with just a DS4 would want to play).
Remember, I know people aren't arguing that two motion controllers would be better, but I'm arguing that some games need those two motion controls to maintain what makes them them. And forcing devs to create a DS4 option would mean huge design changes.
Who says you have to make they playable without massive sacrifices? Any devs that worked on Vive-only games, and therefore rely on motion controllers, should absolutely push move support as the primary and preferred method of play on PSVR. All Sony is saying is they need to work with DS4 as well. And DS4 has plenty of inputs to (poorly or not) map to move controllers.
Just for fun:
Audioshield - left/right analog sticks map to left/right shields. You simplify the input so you can move each left/right/up/down/centered, and you either tweak the orbs to line up with those directions, or you snap the shields to the nearest orb as long as you're in the right area.
Job Simulator - this one I'd make it play like Octodad. Left/right analog sticks flail your arms around and the trigger buttons are for gripping.
Haven't played the last one so I can't comment on it. (edit: Not sure about some of it, but the gesture stuff for triggering spells you could draw with the analog stick like Trine)