So here are three programs that expect to be in the playoff every year, yet realistically, the ACC is a 1-2 bid conference, so at best, two of these teams are making it in in any given year. And right now, SMU is better than all of them, Louisville is doing well, and there are a number of other programs who are going to have good years from time to time. Basically, a coach taking any of these jobs is almost guaranteed not to live up to expectations. If you're choosing a job, do you really want one where you're set up to fail?
At Vandy, you just have to be one of the top 4/5 Big Ten teams to make the playoff. There is a good chance Vandy will make the playoff more in the next decade than at least one of those historically vaunted ACC teams. And guess what? When Vandy doesn't make the playoff, fans won't be calling for the coach's head.
GA Tech, also on your list, doesn't have the same weight of expectation, but also has a far worse chance of making the playoff year-to-year. Again, the ACC is at most a 2-bid conference. What's easier, making GT a top-2 ACC team or Vandy a top-5 SEC team? I would go with the latter.
Same issue with the Big 12 - at most 2 of those schools are making the playoff in any given year. Yet you've listed almost every job in the Big 12 as being better than Vandy.
And then there's the resources issue. Every single year the gap between the Big Ten/SEC and Big 12/ACC grows. That's going to mean less money for the assistant pool, potential problems with fully allocating the revenue share, less money for facilities, potentially less NIL money. Some of these programs may get lucky and get an opportunity to bolt for the Big Ten or SEC. The majority won't, and will be even worse off when that happens. Over time, what remains of the ACC and Big 12 will get a lot closer to the G5 than the P2. You might have a couple programs who continue to do well, kind of the equivalent of Gonzaga in basketball, but with the way things are going membership in the Big Ten or SEC is almost going to be a pre-requisite for being taken seriously.