i don't really like Pyrodex. I never have, BUT when it was free, or when it was all I could get, I used it. I've also used Triple 7. Both have idiosyncrasies I had to deal with, so I developed "tricks", like putting seven grains of 3f black powder down the bore ahead of the substitute BP charge, cleaning immediately after using Pyrodex, dealing with the crud ring Triple 7 makes. Some day, somebody will come up with something else that has all the performance characteristics of black powder but none of the drawbacks. i suppose if that is all that is available, I will start using it.
If you are shooting a flintlock, it won't work. If you are shooting a traditional caplock, it might work.... perhaps with some adjustments. If you got an inline, it'll probably work just fine, ditto with an underhammer gun.
Is Pyrodex uncool? Who cares?! If it works for you, go ahead and use it. I have long "sat" at the "uncool" table. The cool kids became yuppies and do not know which way to point a muzzleloader and probably never saw one. None of them would be able to find their way around my smithy or even do simple woodworking to make a functional table.
Jesus, Galileo, Da Vinci, Einstein and Hawking never sat with the cool kids. i figure us uncool ones are in good company.