I'll tell you, exactly why.
99% of users don't need more than a 500GB drive for the OS and installed applications. Windows itself rarely takes up more than 50GB, rarely, and even with installed applications so long as the games themselves are not installed on the OS drive (And they SHOULDN'T be anyhow if possible) it would be rare to see disc usage exceed 250GB. I have FAR MORE applications installed than the vast majority of users and my primary OS drive is only using about 125GB. Only game loaders need to be installed on the OS drive and those take up very little space. Actual game files, when possible, should be installed to a secondary drive for a number of reasons.
For one, the OS drive will perform MUCH faster the more free space it has on it.
For another, if your game files are installed on the OS drive, and something happens such as a virus, malware, corrupt registry or any number of things that happen ALL THE TIME to Windows drives up to and including a physical failure of the drive, then ALL those game files are toast. It is FAR more likely for something to happen to the OS drive than it is to a secondary drive. So putting the game files on a secondary drive just makes much more sense from practically ANY point of view.
As well, it is MUCH less expensive to buy a 2TB SATA drive than it is for a 2TB NVME drive, and the different in performance in this kind of scenario where the majority of reads and writes are going to be either small consecutive or for the most part, random, isn't going to be that much different between a SATA drive and an NVME drive. It's really only when working with large consecutive reads and writes that you even begin to come anywhere near the advertised maximum throughput on those NVME drives. For game file access loading maps or levels etc., or saves, you are never going to see anything near those speeds. Not even in the same realm. So spending like half the price for a SATA SSD that can, at 2TB, store a significant amount of games and other backup files, just makes far more sense.
Now, if money is no option and you can afford to go with a 2TB NVME drive instead, then more power to you, whoever you are, but for most people saving 100 bucks is often kind of a big deal. I mean, that's the cost of the Windows license, or another piece of hardware, or the ability to get a graphics card that has somewhat better performance. And, the MX500 drives are VERY reliable and have very good performance, yet are significantly less expensive than any of the Samsung models that are not dram-less. Sure there are less expensive models from other brands out there, but just like so many of the Sandisk SSDs have died early deaths, I simply don't trust most of them and try to avoid them in favor of brand models I KNOW I can trust when possible.