גרופה קטומה

If its so easy to turn up the fire with a knob it seems hard to understand reb moishe’s teshuvah that the gezirah was not on adding wood. Lepoal it is very easy to mistakenly turn up the knobs. And that is the whole חשש . There is no גחלים to stoke. If he wants to enhance the food, he will turn the gas up. There isn’t any other thing to do. Maybe in those days there was two things to do stoking the גחלים and adding wood but over here there is no stoking just adding gas, so it seems different that way. And maybe according to rashi that its because of מוסיף הבל it makes sense to cover the stove. But forsure according to tosfos it should be much better to just cover the knobs and there isnt any issue. But even according to rashi, it is seems like it’s something that’s could be very common and the only way to add heat so maybe there should be a gazirah. ?