I think the bad calls have more of an affect because of three things...overall league parity/salary cap, injuries, and rule changes.
1) Salary cap means you can't keep your best players...teams paying an assload of money to top QBs end up being deficient in other areas. Vast majority of the league hovers around the 7-9 to 9-7 mark. Hard for team to excel in all phases of the game.
2) Injuries...even if you do have a 'good' team, that team is usually dependent on superior performance from one or two players. If a superior player gets injured, then the good team immediately falls back to 'mediocre'. Teams can't afford to have superior depth in case of injury.
3) Rule changes...the NFL is now basically 'red zone ball'...every drive ends up being a scoring drive, the only question is if the defense can stop you in the redzone and hold you to a FG, or if they allow a TD. Blowouts don't happen as often as even teams with Josh Allen at QB can scrounge together 28 points. Games are seemingly back-and-forth scoring, so if a ref call upsets that flow, it ends up costing one team the game.