Aren't laptops hard to cool? If you use them for gaming, don't they get hot or warm? I suspect the fans get loud?
I would recommend an ITX build if you want to game and have it somewhat mobile. The only negative for that is that you have to connect a display but how different is that with some notebooks that are 'hybrids' - acting as tablets with the screen detachable?
At least, with some itx builds, you can install discrete graphics cards of your choice (for the most part - within limits). Yes, those are hard to cool, too, and you might have noise but I suspect it's easier to deal with than notebooks - probably cheaper, too?
yes, gaming notebooks get warm...hot even, but when gaming it's likely to be on a desk/table, not your lap, so heat isn't an issue unless there is serious CPU throttling going on.