OK,of course a double stack is better in a fight.
For a percentage of encounters,more than 7 may be required....Some environments and circumstances may suggest carrying a different "level" of firearm.
If I get in a fight,sure,I may want a major caliber double stack.A red dot 38 Super race gun might be nice.
But two factors mitigate that,to a degree.
One,"Get off the X" If I stand in one spot with no cover and shoot 17 to 27 rounds against multiple armed people...I might get swiss cheesed and dead.
If I shoot and move to cover,and if I practice my mag changes,its less of an issue.
Two,yes,we can say "Carrying isn't supposed to be comfortable",but if in fact,the fat double stack stays home when the 6 or 7 +1 would be carried,a little gun in your hand beats a big gun at home.
And,remember if you have a 7 +1 in the gun,extended base pads make your reload 9 +1 or more.
I do not regret my S+W M+P 9C with 12 rds and 15 rd reload its very good!,but I do have an itch for a 45 Shield. About 22 oz,a little longer grip than a 9mm Shield,and the same basic payload as a 1911.
Might be a good pair.