I thought the point of water tanks is that one needs a simpler / weaker pump to maintain the water pressure. i.e. if you want to maintain water pressure X, wit

I thought the point of water tanks is that one needs a simpler / weaker pump to maintain the water pressure. i.e. if you want to maintain water pressure X, with a pump you need something that can push X, but with a tower, you just need a pump that can keep the tower full over the course of a more length period and just has to pump at the average of what it takes to keep it full over the course of that longer period (i.e. the average pressure needed to maintain the tower is less than the pressure you need to provide).