As a lifelong Liverpool fan, I can tell you, fans here have the exact same complaints about FSG, but are less in volume due to us being in with a shout of winning a lots of titles recently. That said, the club has outperformed its spending limits for years, mainly down the world class management structure they have in place.
So they aren't taking from that part of the pot for sure. I don't think it's a financial issue at all. I think it's more that their attention is now drawn in a dozen different directions, with the investment portfolio only increasing.
As an aside, when they took over at Liverpool, they conceded they knew nothing about football (soccer) and so put in experts that did. In baseball, I think they see themselves as the experts and so need no such favour from elsewhere.