Targeting, slashing, hacking, attacking: The key actions you take in any PC game happen at the click of your mouse, so you can't skimp on your weapon if you want to win. Today, though, the quality bar is high for all but the cheapest gaming mice, so you can afford to be picky. Nowadays, you should expect reliable connectivity, smooth and responsive tracking, and crisp click and scroll functions. Those are the table stakes—it takes much more to elevate a "good" gaming mouse to "great."
As far as storage is concerned, hard drive prices have come down compared with solid-state drives, so finding large capacities isn't too much trouble. 1TB of storage and maybe even a small SSD alongside are common in budget laptops. The display will almost certainly be 1080p (1,920-by-1,080 resolution), as 720p is now reserved only for cheap non-gaming systems and increasingly uncommon. The RAM will likely top off at 8GB in budget laptops, but you will find some (more ideal) 16GB laptops in this range.
With that out of the way, that doesn’t mean that gaming mice are just gimmicky because they are not. Thanks to their high DPI, programmable buttons, customizable macros, and a lot of other features that are suitable for gamers. That’s why the market is so saturated with gaming mice, there are just too many options for the average gamer to choose from, and while it is certainly a good thing, it also makes a customer really, really confused.