I have no idea why you keep treating the frame rate cap as a performance thing, it's not. It's 100% down to being a bad port and the game being programmed badly, they literally can't raise the frame rate without the game breaking. Run the game on a super computer 30 years from now and it'd still run at 30fps.
That is the nature of software - whether we're talking games or productivity applications or even operating systems.
ALL software has some sort of performance cap - even Excel (spreadsheet software) has a limit as to how fast it can calculate - and it's not a hardware limit, either.
You don't like limits - fine. I don't have a problem with that opinion per se.
What I have been saying is that there are disadvantages to concentrating all the development efforts on maximizing performance on the high end. (Every game developer has said the same thing - even PC-focussed game developers.)
Concentrating on the high end means that the middle and low end will inevitably suffer for it.
That nasty realization led DIRECTLY to consoles, and developers catering to that need because there was no need for a software cap - all consoles are alike by design; basically a HARDWARE cap.
Meanwhile, with a new generation of the consoles (easily the most PC-like consoles ever) there is also pressure on the PC gaming market to grow - and during a still-poor economy.
You can't grow while starving the low-end and midrange of gaming quality - which most admit the concentration on the high end (whether the game is a console port or not) definitely does.
Those minimum (and even recommended) requirements to play a game (and especially a AAA game) have to be realistic - and until the implementation of caps, they have NOT been.
Look at the minimum and recommended requirements for the original Starcraft (Anthology - which encompasses the original game and the Brood War expansion) - how well would you say it hit the targets of its day?
How playable is Anthology today - on modern hardware - in YOUR opinion? (It's far from facetious - I happen to own Anthology, and, quite bluntly, it looks meh and quite flat compared merely to Sins of a Solar Empire, let alone either Wings of Liberty or Heart of the Swarm - and I have hardware closest to the floor of the latter two, while it was not even a consideration in Anthology's heyday.)