absolutely. Sun is one of the worst things for the leather. It’ll tighten up and whatnot. Proofide keeps it JUST moist enough, makin’ it all shiny and smooth for riding. Leather dries out.
DC… and it does help.
There’s a business opportunity in here someplace. All you need is a some star tarck rider to “professionally” break-in the saddles. Then you can charge a premium for the pleasure of riding a saddle broken in “just for you” by Johnny Tarck. Profit!!!