I don't think that is a safe assumption. While good controllers do wear levelling, there are many that have less capable wear levelling. Also, even with reserve

I don't think that is a safe assumption. While good controllers do wear levelling, there are many that have less capable wear levelling. Also, even with reserve blocks, having a constantly full drive can make inferior controllers cause abnormal wear. This is probably less of a problem even with lower end controllers today, but let's not forget the early Sandforce controllers... those chips could be part of the recycling process.