You mean an SMS message, right? Is this just on the XA2 or other particular phone, because I don't think I've seen it on my Xperia X. What specifically is the experience?

I do regularly clean up the messages, so I delete a few each week -- I think I must be in a middle ground of deleting messages. I keep most from loved ones. And if I had a boss texting me orders, I'd for sure keep those to "ensure quality of service" as they say when a business is recording your phone call. But I usually only keep at most the latest text from the pharmacy telling me to pick up my dog's antidepressant or whatever just to know when I last did that.