The advise here makes sense. I'll keep everything original, at least until I experience an issue or find a compelling reason to swap out the 5s for a 6. I still wish I knew why Glock went from the 5 to the 6 (and now, from the 6 to the 7).
I did speak with Glock in GA but they basically said swap them if I want but it's not necessary, and they couldn't offer a reason for the upgrade.