Hahah.. "How is it relevant where they bought it or who installed it?" Very relevant in many cases. Maybe you have experts installing things who read the instr

Hahah.. "How is it relevant where they bought it or who installed it?" Very relevant in many cases. Maybe you have experts installing things who read the instructions, but I'd say more installs then not have some kind of install error. Super common but maybe not so serious including leveling issues, then clearance issues for all sorts of items but particularly affecting items that need heat exchange or ventilation. Then onto electrical / wiring screw ups, then install damage of various sorts. People are buying very complex devices now, coupled with cost savings efforts by MFGs (everything built to basically minimal tolerance) and these are not you grandparents refrigerator anymore. By the time the items gets to your house it may have been VERY roughly treated - on and off a truck to the store, around the store, on and off a truck to your house, into your house etc etc. In many cases the installers are paid dirt money basically and these are big awkward heavy items.