Laptop IS for mobility. Currently i own a relativly old Q6600 4 gb ram and 560 Ti.
Im getting a laptop (gaming one) before a new PC BASICLY becouse i dont need to improve my Desktop to play games on very good details.
However i do need a laptop for my traveling. i think its a matter of needs. Also note that for 704 bucks you can get a "ok" laptop that wont be for high quality gaming, where as for a desktop it would be a Decent option.
In short, Look for that will be more used over time, since all pc/laptops degrade in quality over time