If I want to buy/sell parts on FB Marketplace, how important is feedback, profile, and friends?

IMO one must have their own account if they are a consistent and regular seller or buyer on FBMP. Very inconvenient going thru a wife's or kid's account. Setting up your own profile does not mean you must also post pics of yourself, make daily posts, issue updates and post selfies. You will get bombarded with losers but you can block them so they cannot continue their BS.