So hypothetically, let's say you had two firearms to pick from for CCW, and only two you could choose from. This is hypothetical, to make a point, so I'm not looking for how to fix the gun(s) - my point is related to the percentage of time some leave their gun at home for 'fashion' reasons, and how it essentially equates to the same thing as having an unreliable gun.
One of your two CCW choices in this hypothetical scenario is a Ruger LCP in 380, that you bought from a trusted friend who has put a thousand rounds of various brand ammo through it without a single malfunction.
The other firearm choice in this hypothetical scenario is a Glock in 45 ACP, that another trusted friend has for sale, but readily admits that he's tried all kinds of different ammunition in it, and even sent it back to the factory, and the best it can do is to function about 80% or 90% of the time as long as you use the specific ammunition (Federal Hydra shock hollow points) he has found works best.
You are an experienced shooter and confident that with either gun you could shoot plenty well enough to stop an attacker.
If those were your only two choices for carry gun, assuming you didn't feel like somehow you were going to be able to make the Glock function more reliably than the previous owner, given all the effort they had put into it....... which gun would you choose...???
I'm betting some would say they'd choose the Glock and figure they could fix it, which is why I put in the bit about it already being tried even by the factory and failed. Remember, this is a hypothetical scenario. So the rules say you cannot fix the gun but have to settle for it in the condition as described.
With the above scenario, I'm betting most folks here would pick the little Ruger LCP, even though it's not as powerful or high capacity as the other gun, because we all pretty much want reliability above all else. Skills have a hard time compensating for reliability, but skills can use shot placement to compensate for chambering and capacity.
I had a patient tell me the other day that she had gotten her concealed carry license and was starting to conceal carry, but because of "difficulties with female fashion" she sometimes wouldn't carry the firearm. I asked her what percentage of the time she did carry it and she said probably "at least 80 to 90% of the time".

That's essentially the same as having a gun that fails to fire 10 to 20% of the time. Shooting skills cannot compensate for a firearm that is not there to shoot with.
Better to have a firearm that is 100% of the time reliable (because it's on your person 100% of the time), chambered in a marginal cartridge, then a gun chambered in a proven 'man stopper' cartridge that misfires 10 to 20% of the time.
Anyway, that's a good way to think about concealed carry firearms choice if you are someone who is in a situation where due to fashion preferences or whatever who is apt to carry less than 100% of the time. As I told my kids when they started going out into the world, in the movies, right before something bad happens, there's usually scary music. I have yet to speak to any victims of criminal assault who said scary music gave them a heads up so they can go get their gun. It needs to be there 100% of the time unless legally prohibited or unless for some reason you plan to be incapacitated, such as drinking too much alcohol or whatever.