I agree 100% that pressure from on high is a factor.
However, I've seen FAIPs of all ppl refuse to fold to this pressure and uphold the standard. If an Lt hoping for a fighter has the intestinal fortitude to do the right thing then I have little sympathy for O3-5s worried about their next assignment. These are officers we're talking about, not jr enlisted, they need to act like it.
I agree UPT line IPs are younger/less experienced than ever. Which is why PIT has a large share of blame as well. PIT won't wash out IPs coming to their sq that have no business instructing young IPs, much less hold the line on UIPs they're sending to UPT.
I have zero issue blaming leadership/congress/etc. for terrible priorities on retention and procurement. With that being said, how many times have I read dudes on here bitching about all these senior leaders that refuse to fall on their swords to make a point to leadership for the sake of their service, Wg, Sq, etc. Yet here we are making excuses for officers folding to pressure on grading standards. Hard to expect the Bobs to suddenly grow a backbone if it's never been required they have one in the first place.