iOS 13 is blazing fast on the 6S- they actually claim performance improvements over iOS 12, and I can confirm that it is true, in my experience.
Really?
I installed ios 13.something some time ago just to try it.
Downgraded to ios 12.4.1 just after 2 or 3 days mainly cause the software didn’t feel tailored for the 6s like ios 12 does.
Later I found out apple stopped signing ios 12 the same day i downgraded. That was lucky lol
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I think iOS 10 worked the best on the 6s IMO. Definitely keep 12.4.1 on there.
I have been refusing to update my iOS for years now and never had any issues with security breaches or anything like that.
The problem is unless you’re jailbroken there’s no way to tell if you have hidden malware.
But yeah those updates just lead to planned obsolescence and less privacy on each update