I think I know where you are coming from. Han's younger & lesser adventures may somehow detract from his persona &/or ruin the mystery. I disagree. I'm looking forward to looking backward in time to see the events that helped shape the man he is today, not just from trilogy series. 'Lesser' adventures does not necessarily equate to unworthy or unnecessary backstory IMO.
Although different, it reminds me when distinguished music artist 'come out of retirement' to pursue their love of their career. Some fans will always reject the revival. Please don't go ruining the legacy you left us with, blah, blah, blah. We want to remember you as you were then, blah, blah, blah.