I run a catch can on my 2014 Mustang GT, my fiancee's 2007 Mustang GT, and her 2017 F150 with the 5.0.
What first got me interested in catch cans was when my fiancee's 07 GT was starting to smoke on startup with low mileage on it. I went to the Mustang forums to ask some questions and a few people said to check the line going to the intake from the PCV valve and see how much oil was inside the fittings at the ends of the lines since this engine(4.6L) would pull a lot of oil into the intake. They said to install a catch can to stop the the smoking. I installed one and it quit smoking on start up. The PCV line on her car was soaked with oil.
I did the same thing in my 14 GT when I first bought it. My PCV line also had a lot of oil in it. Who knows if it extends engine life but it can't hurt anything.