Haven't heard of a single starter *crapping out* on a KL, yet. Yes, it's early (V6 2015s aren't 5 years old yet).Nanny state BS, of course I hate it. Just another thing to cause the battery and starter to crap out earlier.
But I will say this about batteries : although on paper an AGM battery would overcome the added stress of ESS duty, these particular Johnson Controls OEM group 94Rs/H7s are definitely a poor offering in these vehicles : they are undersized and poorly constructed. Yes, I do believe they die too early, but I wouldn't say ESS is the primary reason... underhood placement causing high heat exposure is the primary reason, I think. Anecdotally, V6 2014 wet batteries don't last all that long either, but I don't have real statistics to back that up. With a higher quality replacement AGM, I'm pretty sure ESS won't shorten its life, at all, and underhood heat won't kill them as early either.