So this is not always true, though generally more likely. Some teams are much better than their conference as a whole and so may play few good great opponents.Looking at the 2021 draft, the two worst quarterbacks came from schools with less elite talent in Wilson and Lance. Lance was so bad that even San Fran couldn't make a QB out of him. I'm not sure why "played with great players" belongs in the con column when it invariably is paired with "played against great players". Weird take honestly.
But yeah, playing with great players can mean you can't see certain things on tape. Like Mac Jones, he faced zero quick pressure or repeated pressure in his whole time at Alabama, and he had a lot of easy throws to open WRs. So that made it hard to tell how he'd respond, but.... you could say the same for some other QBs on loaded teams who ended up just fine. Honestly if I were worried about a guy playing with great talent it would be Penix because we saw how he struggled against a top defense who got pressure. I have no concerns like that for Daniels, because he carried his team against tough opponents and his line was not great. He's not a perfect prospect at all, but you can see most everything good or bad in his tape, there is plenty of tape on how he handles pressure, decent amount of tight window stuff, etc.