Also as you noted, these earliest examples were going up against flintlocks and actually one of the biggest selling points in a lot of the early reviews of the Pauly system was the benefit of not having the huge flash and powder from the flintlock ignition.
I think it was just too far ahead of its time though and the ease of a percussion cap was greater than having a liquid/powder priming compound even if you could have 50 of them made up ahead of time and 100% ready to go so it switched to that. You still had the benefit of a paper cartridge rather than loading loose power and shot down the barrel.
And then looking at systems like the Robert breech-loading system which was clearly inspired by this you start to get closer to fully-self-contained cartridges that you didn’t have to hassle much with. And tests between it and the 1833 percussion break-open Lefaucheux generally favored the ease of use of Robert’s cartridge.
A couple years later Lefaucheux’s pinfire system comes around and really revolutionizes everything as now you have a complete package from the manufacturer where you do not have to have a separate primer or priming compound to load into the cartridge or use externally. And this finally made these more expensive cartridges worth it as you removed that extra hassle.
