(Not a question about "General TIres" - just a tire question in general!!) ;)
As tires wear down over the course of their life, can the ride given by them become harsher/rougher? Or does that have more to do with the aging of the tire rubber itself?
My question assumes all other things being equal - tire pressure within 2lbs of spec year round, yearly or as needed wheel alignments, minimal to no suspension wear, and moderate driving habits: few jack rabbit starts or sudden stops.
-ChrisCoaster