We don't use that sort of thing since:
- Those values can't be calculated, and have to be found experimentally, which makes them inapplicable for a lot of characters.
- Incorporating them is often fairly difficult (a calculating of a character jumping to the other side of the planet goes from a few lines to a few pages once you try to take drag into account), which also means that there's fewer people knowledgeable enough to evaluate them.
- They massively increase the results of feats where people bother to incorporate those, making the previous issues cause more of a rift in our community than if they just made the results, say, 10% higher.
- While it makes things more accurate to the physics, one eventually gets to wonder whether it makes things more accurate to the author's idea of the character when writing. If they wanted the character to be millions of times superior to that destruction, would feats relying on principles that few can intuit properly be the only way the author would go about expressing that?
None of these are, like, objective slam dunks debunking the idea of anyone using that, just why they're not something we currently go by.
There's a bunch of ways in which our indexing is inaccurate, and I think there's better gains to be had from improving in areas other than this one. In practice, implementing this right now would just make the 5 verses people bother to apply this to hundreds of thousands of times stronger, and hundreds of times faster, widening the gap between them and verses where people lack the motivation to do this work.