Earlier quoted context omitted.
I am not too happy about that. HP already has USB charger for laptop, and it had bunch of problems, including fire hazard. That was just ARM chromebook, not sure how it will on 'full' mac. EDIT: there are physical limitations how electric current is transferred. USB contacts do not have good shape and will probably deteriorate more quickly.
In the old days, HP had a high standard of quality. More recently, almost coinciding with the introduction of inkjet printers, HP quality standards have slipped to a new dismal low. I'm not surprised to hear of fires.
That said, I am kind of looking forward to my (about) 4 year old MacBook Air eventually dying and then I will buy the new model that was announced today :-) MacBooks are beautiful.