Going to go out on a limb, speaking from personal experience here, is the problem is the promise of a single Peter Parker finally being free to actual pursue other relationships really haven't be delivered.
I'd be with you if Amazing tried to actually offer an alternative relationship for Peter. We're now 17 years into the marriage being dissolved and every relationship attempt outside of Carlie Cooper has been rather half-assed. And the Carlie Cooper breakup occured over 12 years ago.
And you can say "well the fans were so negative to Carlie Cooper, so what's the point" but then I feel like that is basically admitting they've backed themselves into a corner with Peter's romantic prospects.