I'm not sure why you'd make such a bogus claim.
Take a typical alloy frame officer size 1911, it is slimmer than a Glock 26 while being similar in length and height. Its also right about the same weight.
Or compare a typical alloy frame commander sizer 1911, again slimmer than a Glock 19, but similar in length and height. Oh, and right about the same weight.
Now for those who carry a full size XD/m, Glock 17 etc that is roughly the same size as a Government model 1911 and roughly the same weight as an alloy framed full size 1911 too.
In each of the above sizes, a steel frame 1911 will weigh more than the similar size Glock or XD, etc.
But in each case, the 1911 has actually been considered one of the easiest firearms to conceal because they have such flat sides. There is nothing extra to poke out or print against fabric. Personally I find it much more comfortable to carry a small all steel 1911 than it is to carry a Glock 19 or 26.
Just to disprove your statements here are some photos:
Thank you for showing what i said above and reinforcing it...+1 rep my friend on the picks