Preach, bother. ..
Me too. I'm in my mid-fifties and I am literally a Software Product Manager (not games), and I couldn't agree with you more!
Heaven forbid you (using your acquired skills) ,run up a decent record. Oh, no, we can't have that!!! Let's have a 20 point OVR underdog team STEAMROLL you! Yeah, great idea! Let's punish our users for being good at our game! They'll love us for that! (Spoiler alert, no they won't).
Not sure if it's by game, or by drive where this kicks in (or both, tbh, feels like both), but you get it basically every game once you've built up a decent record and/or gone up a few scores.
To me, there does seem to be some sort of secret threshold seems to be right around as you go up by that second touchdown. As soon as you go up by 14 points against an underdog, it's game on!!! The next hing you know you're the Bad News Bears and you're playing against the '85 Bears defense and the 2013 Bronco's offense. You are flat out going to get steamrolled from here on out. Sorry, there is nothing that you, as a player of the game, can do to change that fact.
So insanely frustrating!!!
Fix this EA!!!!
EDIT: I think this may be an issue only with Human vs. CPU, and maybe only in single player offline dynasty mode. My reason for thinking this is that it's so unplayebly bad, that if it were affecting online dynasty and other modes then no one would be able to play this game at all and there'd be torch and pitchfork crowds in the streets (so to speak).