Your wrong on all counts. I forgot to mention aluminum framed handguns are also notorious for frame rail wear which causes a loss of accuracy. The gun writer George Nonte from Shooting Times magazine had a Smith 39 break off its frame rails at only 5,000 rounds and the two P88's used in the U.S. Military trials only lasted 7,000 rounds. That is not a lot of shooting. Colt Commanders were notorious for breaking their frame rails. And we are all familiar of the various Beretta 92 failures when the U.S. military used those guns.That's not a hidden danger. That's a complacency in equipment and training. Nights sights are not a replacement for a weapon light, and yes the light washes out the dots anyway. What I've been trained to do is get the night sights up and aligned, then PID a target. AND night sights have a half life of 12 years, not 5.
Says the US Military with the Beretta 92 and the US Navy with Sig P226s. Oh lets not forget the German military with the P38 while we're at it. If aluminum is such a poor choice in a fighting pistol, explain to us why they have been in continuous use for decades.
You carry the pistol you are proficient with. If by some reason the OP wants to carry a SV Infinity (which is by and large a very expensive pistol) or a Janz Revolver, he could. Yeah the value will drop, and yeah he'll have to get a custom holster. Rare pistols? Probably. "Very Expensive"? Not even close. If he shoots the P88 and trains with it well, you can find a holster for it if he's willing to commission a holster maker.
You can find some carry worthy P88s and compacts for $700 for trade ins up to $1800 for commercial variants mint in box.
But, but.....the Sigs are aluminum?! Different guns fullfill different carry requirements for different people with different body types. You do realize the Glock 19 and Sig P229 are nearly the same size as a P88C?
OR you have Browning Hi-Powers that are exceptionally accurante that they keep up with a Sig P210 and P88 full size. Accuracy isn't paramount in a gun fight huh? Say that to the guy who made 8 out of 10 hits on a dude at 40 yards in a mall. You're suggesting "usually" along with all the other statements you made above are actually "absolute" advice?
Again, his money his choice. Would we be having this conversation back in 1995 when the P88C was released? It was sold as a defensive weapon, so he wants to carry it, how is this any different from someone carrying an old USGI 1911? He never suggested it was a collectable and if he did he wouldn't be here asking us about holsters and the lot. You seem very invested in downplaying his choice to carry what he wants. Before you do that, maybe it's best you give objective advice versus conjecture based on your small sample size of experience.
AND HERE ARE TWO OTHER P88 FAILURES THAT I FORGOT TO MENTION DURING THE U.S. MILITARY TESTS.
The Walther P88 was entered for the third and final JSSAP XM9 pistol trials conducted in 1983 to 1984 with interruptions. During the trials, the Walther P88 ended up being eliminated from consideration for not meeting a handful of the 72 “must” conditions. Firstly, it lacked the specified manual safety function. Also, the P88 failed the dropping tests, with the rear target sights popping off and the pistols frames cracking from 7000 rounds of sustained fire. The P88 also failed both the wet and dry mud tests
I might add post war aluminum frame P38's also had frame failures although they did last a lot longer than the junk Smith & Wesson M39.
Aluminum framed handguns were originally designed to save weight NOT add to reliability.
The aluminum framed handgun is best ,as Jeff Cooper once said, "Carry it much but shoot it seldom". Good advice from a well know gun guru back in the day and damn good advice still today. But I am sure you will tell me you know more than Jeff did or the "hands on" experience I have had with catastrophic aluminum frame handgun failures.