People that are upset tend to fall into two categories IMO. Feigning upset just to have an argument, and those with legitimate concerns. Those in the later category are right to wonder how Sony and developers will handle this as it's new territory for consoles, but one must accept facts and also as things stand just now air on the side of caution as we are all discussing rumours.
The facts IMO are simply looking closely at how PC titles work, and giving devs a bit of credit that usually they do have their games best interests at heart and do not step out to intentionally gimp games technically. Yes there are many examples of poorly optimized games, but there are many examples of technical marvels.
To the gaming elite, maybe so, but that's why many people go to a PC and never need to complain, they just upgrade their PCs and enjoy master race graphics. To many others the differences between XB1 and PS4 mean nothing really, and it's about enjoying games and playing with friends. One camp is not like the other.