Is having huge battery useful?

Gaming Laptop owners, is having huge battery capacity on gaming laptop ever been useful to you?. Cz am assuming most of you guys mostly use it while charging, isn't it better for manufacturer to save the space to improve the cooling?

I know that even with large battery most of them cannot last up to 4hours doing non-intensive task let alone having smaller battery. But even then how often do you guys left it unplugged from the wall?