I took a quick look through recent draft history to try to see how often the first QB taken actually ends up being the best QB from his draft. I started with 2021 and worked backwards, as I think the last two drafts are too early to call:
2021: Trevor Lawrence - Definitely the best of the bunch so far, though we saw first hand how different it looked when the rest of the operation was a mess. He didn't fix anything by himself.
2020: Joe Burrow - I think he's been the best so far, but Jalen Hurts in the 2nd round is right there. Tua and Herbert have proven to be no slouches either.
2019: Kyler Murray - While he is technically the best of a bad lot, is anyone inspired by his tenure in Arizona so far?
2018: Baker Mayfield - Josh Allen at #7 and Lamar Jackson at #32 have been leagues better than him.
2017: Trubisky went #2. Mahomes went #10. Enough said.
2016: Jared Goff - Late bloomer, and outshined so far by Dak Prescott (though that's a bit of an abberation in the 4th round, and Goff is having a great year). I'd say he's the best of a ROUGH year for QBs.
2015: Winston and Mariota went 1 and 2, and it somehow went DOWNHILL from there. So they were the "best" but... ugh.
2014: Blake Bortles - Derek Carr went in the 2nd round and has been the best of that year by far.
The point here isn't that having a high pick isn't better in a vacuum, it's that intentionally tanking (which I don't believe many teams, if any, actually ever do) to get one guy specifically is as likely to get you a Bortles or Mayfield as it is a Burrow or Lawrence. I'd rather they keep trying to build winning habits, and let the pick fall where it may.