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I propose a cap of +7 total to the Armour + Shield component of the AC (not counting magical enhancements to either).
What this does is adds just a touch more realism to the game.
In the real world, shields fell out of favor as plate armour became available.
As the shield was rendered redundant and unnecessary, knights found they had a second hand freed up and began opting for two-handed weapons... which they needed to crack open the improved armour of their (also in plate) enemies.