I agree, I have several 1911's and now only one with flat MS HSG and I'll probably change that too. Just a question on how it feels to meThe arched mainspring housing is supposed to change your NPOA upward a little bit, for more natural pointing. I guess that fell out of favor after WWII, as no one seems to offer it in a stock 1911 any more except GI re-issues. I happen to prefer it, it feels better to me.
Bobtailing is supposed to make it easier to conceal, I guess.