All these comments really point towards lousy Ownership with a blah front office. They don't seem the least bit upset at the current state of the Steelers or keenly interested in getting more competitive. Not quite the "last of the big spenders" type.
That's 100% part of it. They won't fire Tomlin and they won't take power from him despite all the evidence that he just doesn't know what to do with it.
The Eagles let go of Andy Reid, a far superior strategist and offensive mind who actually has a legit coaching tree, after 4 years of not winning a playoff game after years of playoff success. They re-energized the organization and have been successful since with a SB win and a SB loss.
People talk about Tomlin like hes only struggled since Ben retired, but that's just a convenient excuse. Ben was great all the way through 2020 (except 2019), but Tomlin had no playoff wins between 2011 and 2014, 3 playoff wins against crappy backup QBs in 2015 and 2016, and nothing at all since. The Steelers ownership is stubborn and loyal to a fault. There will be several fall guys, but Tomlin won't be one of them.