Well it does require a vented pipe through your roof, and the people subcontracted for installing kitchen cabinetry and appliances are often coming in long afte

Well it does require a vented pipe through your roof, and the people subcontracted for installing kitchen cabinetry and appliances are often coming in long after all the plumbing, HVAC, and roofing guys are gone who are going to have the ladders, be in the ceiling, and have the tar or vent pipe on hand needed to install a roof vent, and it is more of a pain if the stove isn't centered between joists and rafter beams. Now none of that is a great excuse, it isn't that hard to do, but with how most buildings are subcontracted out piece by piece for every little part, and how some things like the kitchen appliance location is not super well finalized until cabinetry is actually installed, nobody before the cabinetry wants to take the responsibility of is positioning and the cabinetry guys are not expected or expecting to install such features. It is time, expense, and the liability of punching a hole in the roof before someone decides they want the stove on the other side of the room, or coming in months afterwards and punching a hole in a brand new roof as someone not the roofer. If everything is well established in the blueprints and nobody is going to be changing their mind, or if one guy/company is doing 90% of the work themselves its not a problem. But often things are changed kitchen wise after most of the house is built or is done by 10+ different contractors, none of which want to be held responsible later on for it. Often one company does the structure, another the roof, another the siding, another the drywall, another the plumbing, another the electrical, another hvac, another cabinetry, etc, and only the plumbing and furnace vents are going to be putting holes in the roof which happens long before any finished features like the cabinetry is put in.