BA is about ensuring that there continues to be a meaningful chance of failure even as bonuses rise. So all the things I quoted from you were statements about BA.And I'll continue to deny the purpose of those other threads really has anything to do with BA
Even vs a +6, you've taken what would have been a 6/20 chance to hit you (with 21 AC) and reduced it to 4/20 (with 23 AC). So you've gone from taking 3.33 attacks per hit to taking 5 attacks per hit. That's like a 50% increase in HP.Most of the creature I am likely to face by level 5 will have closer to +6 or +7 on their attack rolls. An ogre, for instance, is +6.