Stuff happens. Are you ready for it? We can buy based on low price, tell ourselves its good enough, (indeed, after all, good enough for 60+% of police, USPSA production, IDPA SSP, growing number of militaries), and pay the smallish incremental up charges for sights, trigger jobs, grip mods, stippling and now slides.....
Or reason to think hard about VP9, Sig 320?
I'm not sure what you're getting at.
Sure stuff happens, to any gun, but I buy and carry Glocks because they fit me and I can shoot them well, not because they're inexpensive; I don't need to do grip mods, stippling, trigger jobs or even install larger mag releases nor slide stops, all I change are the sights. So for a gun that I like to shoot a lot, wondering about changing to a perhaps more durable slide makes sense to me.