TL;DR: #decimal is a fine system for people who need to multiply/divide by:

- 2
- 5
- 10

But #dozenal (AKA #duodecimal) is better for folks who multiply/divide by:

- 2
- 3
- 4
- 6
- 12

Basically #dozenalism is the idea that *generally* math would be a hell of a lot simpler if our number base had more (useful) factors, which we can practice by using 12 instead of 10 wherever it's practical.