If you make a claim like this can you provide details?
My anecdote: I'm using an iPhone XS that has seen 4+ years of use across iOS 12-16 (5 major versions) and I haven't noticed any real consistent slowdowns. I've seen the occasional clear bug shipped where performance dips from time to time doing certain specific things, but these seem to be resolved upon the next update or two usually.
My anecdote: I'm using an iPhone XS that has seen 4+ years of use across iOS 12-16 (5 major versions) and I haven't noticed any real consistent slowdowns. I've seen the occasional clear bug shipped where performance dips from time to time doing certain specific things, but these seem to be resolved upon the next update or two usually.