Why there are so paid pr for Oneplus

See I know op make good phones but every brand and phone have their own downgrade or bad side but praising a phone blidly without any knowing it truly bad , like if a phone company makes good phone why you need to put other company down just to tell it's good and both vivo iQOO op oppo are from almost same company i suppose and people who post about purchase help , please don't go blidly what people on comment section told you