Earlier quoted context omitted.
Is there any reason or are you just generally a sadist? Overhead luggage is the only place you can take anything fragile. You have no control over how your checked baggage is handled and anything you have to take with you into the cramped seating space will get squished.
One reason that I would value is that it would speed up boarding and deplaning. As you correctly point out, the prevailing overhead luggage system provides a benefit to some travelers, potentially to the detriment of others. It's a tradeoff.
For boarding it might speed things up but often boarding is done before all checked luggage is loaded so it will probably not let you take off faster either.