There is a reason why the 1911/2011 are the #1 gun for competition shooting;
trigger, accuracy, reliabilty
You forgot "custom parts availability". I think that's the biggest
overriding factor. The amount of COTS parts for 1911/2011s
is insane.
Want to make your gun compensated? 1911/2011s have the
biggest variety of barrels and comps out there. With other
guns, compensation is "custom" half the time, and "ineffective"
the other half.
You need an optical mount? No problem, theres at least a handful
of companies that make them, compared to 1 or 2 on a glock.
Don't like the irons that your gun came with? peen them out and
choose from like 5+ other brands/styles/heights.
Don't like that safety? There's 10 others to choose from.
Slide lock driving you nuts? There's probably a dozen or more of those available.
Don't like the grip panels? Tons available in various thicknesses
and other dimensions, from minimalist to "mr meathook" panels.
You want a flat trigger? No problem. Curved kinda, no problem... curved a lot... no problem... short reach, no problem, long reach, no problem.
Magwells? Prolly 10 of those, or at least a LOT.
Magazines annoy you? Replace them- with prolly a dozen other
brands/styles.
-Mike