The funny thing is that Auburn's admin is actually really dysfunctional too. Not as dysfunctional as ours, but pretty dysfunctional. Auburn recruits well, and although Gus is inconsistent his highs are high enough to keep him around. His ceiling is winning a national title (was just a couple plays away from it in his first year, and was a game away from making it back to it in 2017).
I totally agree with you in that why can't we be like Auburn? Usually pretty good, occasionally really good. We have a lot in common with them, IMO. Historical success, passionate fanbase, etc., and also on the wrong end of some natural recruiting advantages that our rivals have. However, despite those disadvantages, Tennessee only plays 3 teams on the schedule every year that consistently recruit better than us - Florida, Georgia, and Alabama. If we lose to those 3 teams every year, and say we drop another game to our non-conference opponent or another SEC opponent, that's 8-4. Over extended periods of time, the worst seasons we should experience are something like 7-5.
"Lack of talent" explains why we can't beat the top teams in the conference. It doesn't explain why we can't beat Vanderbilt.