I have long believed in having duplicates of my favored carry weapons, going back well before any restrictions were on the horizon. Something as simple as a broken sight or other part can bring about the immediate need for a secondary weapon, and I have, indeed, had sights break, and experienced a mainspring failure. I have several, each, GP100 sixguns, and SP101 fiveguns, and pairs of .223 Mini-14 and .308 Browning BLR rifles.
I had several .40 SIG P229 pistols until recently, but have been phasing them out, with just one now, as I hope to be
authorized to switch to a 9mm Glock duty pistol soon. (Cumulative snappy .40 recoil is becoming painful to one of my aging, aching wrists.) If I do switch duty pistols, to my G17 or something else, I will double-up, or more, on that model, too.
So, yes, I believe in secondary carry guns, to the point I normally carry more than one at a time.