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I'm not as up on competitive equipment issues, so forgive me.
But what EXACTLY makes 2011 more competitive (from a technical standpoint) than a highly modified M&P? An Apex trigger, fitted match barrel, quality sights, magwell should provide most of the same advantages.
The 2 big take-aways from my limited perusing on Brian Enos forum is that the advantages are the frame weight and the straight pull trigger. The Apex flat-face was designed to mimic the straight pull trigger, and isn't a 2011 frame actually a metal frame with a mostly plastic grip?
I understand why the Glock trigger can never get to that level (being double action it's required to cock the striker before release), but the M&P seems to have a single action pull to it.
Another factor why the 2011 may have a lot of popularity (according to the same above discussion) is they give out cash prizes to people who win with their guns in certain matches.
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Trigger movement and mechanical accuracy.
2011 triggers can still be reliable with a lower pull weight, less pre-travel, and shorter reset than an M&P (even with a FSS kit). This induces less muzzle movement during the trigger break allowing more forgiveness in the shooter's trigger pull.
Tighter mechanical accuracy gives more room for error in sight picture or trigger control on a given target size allowing for faster target engagement.
For the most part these advantages are measured in hundredths of a second, but hundredths of a second are what win matches at the top level.
FWIW, I actually own an STI 2011, but it sits in the safe while I shoot a Limited M&P in 3 gun. I choose to use the M&P for three reasons: ease of maintenance, similarity to my issued duty M&P, and I'm not in the top 5% of shooters where the advantages of the 2011 over a M&P will have a significant impact on my ranking.