Considering a lot of the rifle ammo I have shot is older than I am, I'm not too worried about rotating carry ammo every X number of months/years due to age.
When I shoot mine up, it is because it is noticably dented up from chambering/unchambering. And even then, it is really a cosmetic thing if I were to be perfectly honest about it. Since I no longer shoot my carry pistol in matches, it very rarely gets unloaded. I think I'm on year 2 or 3 with the same box of Gold Dots riding around in my G19. Not the least bit worried about it. 20 or 30 years from now I might put it on the to-do list.
I have dropped a magazine in a puddle once, it was submerged completely for a few seconds while I dug around for it. I shot up that magazine just in case. No issues. There is a hard press-fit between the bullet/case and primer/case that water is not goinig to readily penetrate, and most commercial top shelf ammo will have sealant in addition to that. A little humidity or sweat is not a concern.
Many reloaders tumble live rounds for hours in order to brighten them up as a final step. No one is blowing their arm off as a result. The vibration present in a tumbler is way more than anything your gun is going to be subjected to outside a tumbler.
Ammo is tough. Shoot it (or don't) and be happy. Keeping the springs, extractor, etc in your pistol and mags up to snuff, especially if it is a gun that sees a real round count, is far more important to worry about than rotating ammo, in my opinion.