I fear that he will now reject my reality and substitute it with his own.
Well I am not necessarily arguing my approach is more realistic. But I would argue it is better for faster, easier gameplay while approximating the same result.When you think about melee combat this way, it's easy to see why subsequent attacks would have penalties, and why those penalties would mount. Your window of opportunity for 2nd, 3rd and 4th blows keeps getting progressively smaller.
The validity of this solution depends on whether you think fighters need that much of a boost or not, so I guess it falls to me to ask: Does a fighter using the standard scheme of iterative attacks deal enough damage at higher levels?The proposed solution of allowing all attacks at full BAB simplifies the dice related math, but while doing so it more than doubles the damage a fighter type can do in a round.
Now consider what you would have to do to the CR of a monster if you doubled their damage output per round.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.