It depends, and I hate answers like that.
I willl take a thick steak or a roast and leave it to dry in the fridge for four days or so.
It is wonderful.
But grind it into hamburger and it should be used within a day or so.
The difference is that the bugs, OK germs, are on the surface of the slab of meat. When you cook it they are killed. When they grind meat the germs are mixed into a place they can multiply ad libitum. And they do. So always cook ground meat shortly after buying.
With chicken all that I have said is wrong. The evisceration process leaves too many nasty bugs about. One or two days at the max in the fridge.
I am usually the person on this forum who says use it.
But putting a plastic wrapped piece of meat in the fridge for a week - well it is just not going to work.