That’s not right. According to the NFL ties are considered a half win and a half loss for purposes of computing winning percentage (and winning percentage is what all the tiebreakers involving records are based on) So an 0-0-16 team would be 0.500.
And just look at PIT. They are 8-6-1. Under your system they’d be 8/(8+6) = 0.571. But they are actually 8.5/(8.5+6.5) = 0.567 as you can see on the NFL’s website.
Likewise, the Packers at 6-8-1 are 6.5/(6.5+8.5) = 0.433 (again, see the NFL website) and not the 0.429 they’d be with your system.
Decades ago ties WERE ignored as you say, but that hasn’t been true for a lonnnnnng time.