Ok, you have a highball glass, a coffee mug and a beer stein all in the same cabinet. Each one holds different amounts of liquid. Think of the web stream as water, man, and if you have a smaller glass, you can fill it with less water. That’s how this works. Mulitple streams of water to fill different sizes of glasses. Like a smaller glass takes less water and would need a smaller stream.
This is like why they have three lanes on the highway all going to the same place man. Some are slower, and others are for faster people.