Those "recommended" settings are from an age when HDDs were still sub-1GB, and every MB counted quite a bit more than it does now. These days with drives going into the TB range, and 2-4GB of RAM being pretty standard even on low end units, there is really no point.
It doesn't matter if those "recommended" settings are to set it to 1.5X the amount of RAM installed, or to simply idle 10% of the HDD, they can be ignored equally. The 1.5X RAM was intended to reduce the amount of disk activity related to growing/shrinking the swap file more than anything else. The 10% idea is just total BS that gets parroted all over the Internet because rather than do some very simple math to show just how idiotic the idea is, people try and feign understanding. All you have to do is some very simple math to see the pointless nature of this one. Say you have a 1TB drive, and using a base 10 system for easier math, that's 1000GB. So what's 10% of 1000? These people are actually suggesting that you idle 100GB of disk space for swap use. Surely I can't be alone in thinking that seems just a little excessive.
I've yet to come across a compelling reason to not just let Windows handle the swap file. The closest I've ever seen is when you're running low on disk space, but barring the temporary shortage of drives right now thanks to mother nature, it's generally easier and more effective to just add more disk space. And if you set the swap file to a specific size, and go too low, you will hit a thrashing state far more often.