So far I don't completely agree with you. Yes, if you can afford it, buy all steel framed BP revolvers. They do last a very long time if well cared for even under heavy use. I have a CVA imported Armi San Marco 1858 Remington that my father gave me for Christmas when I was 15. I went for several years shooting it almost daily. I was on a serious BO kick and barely fired a cartridge firearm (other than my CCW 3" M65) for a few years. It has been rebuilt with new triggers and hand/spring assemblies four or five times but it's still kicking after more than 25 years of use.
A few of us were shooting our BP revolvers at the club one day and having a great time. Another friend showed up and saw the fun we were having and we weren't going through the 200+ rounds of 9mm he did in every range session. He went to Cabella's the next day and bought a brass framed .44 1851 Colt (yes, I know, not historically accurate) with 3 pounds of Triple 7, 500 round balls, powder flask and everything else the salesman could possibly sell him. He was so excited that he went home and dry fired it all night, ruining the nipples. When we met the next day for his first range session with his new BP toy, not a single cap would fire because of the mashed nipples. I told him to spend $10 on a new set of nipples but he was so frustrated that he offered me the entire package for $150. I told him to take a few days, calm down and and think about it, but he just said BP wasn't for him.
I've been shooting that brass framed 1851 for a few years now with zero signs of wear. A brass framed BP revolver obviously won't last as long as a quality steel framed revolver, but after seeing no wear on my three brass revolvers after years of use, you will get many long years of use out of them.