More like the Mahomes deal was extremely team-friendly and is more of an outlier than baseline. Even most of the contracts signed before him had significantly more practical guaranteed $ than what he took. It's just a question of how people look at gtd at signing, vs practical guarantees (i.e. how much money they'll make before its practical that the team can move off them).
If you stack up anybody who's signed an extension the last three years:
2020:
Tannehill: 77% gtd
Mahomes: 31% gtd
2021:
Prescott: 79% gtd
Allen: 58% gtd
2022:
Carr: 54% gtd
Stafford: 81% gtd
Rodgers: 100% gtd
Wilson: 66% gtd
Murray: 82% gtd
Watson: 100% gtd
So even if you don't put Watson as the comp, you've got guys like Murray, Dak, and Stafford who have signed in the last 24 months who are getting 80% guaranteed basically.
Mahomes and Allen appear to be more team-friendly deals, and are also longer in length than any of the others.