I've owned muzzle loading rifles since the 70s. But I didn't start competing with them until the late 90s. There are lots of shooting disciplines that took up my free time.
I have found through out the years regardless of what shooting sport you are talking about, not every one involved in them are what you would call competitive shooters.
There are folks that satisfy their shooting needs with a monthly club shoot. Some, specially with muzzle loading clubs, are more interested in the social aspects of their clubs, and shooting is just a byproduct of that.
Most of the folks that post targets in ALRs Postal matches are competitive shooters. Folks that are not satisfied just shooting once a month, and even less satisfied with shooting poorly. I believe that the best practice is to be had when competing against other like minded folks, Competition sets the bar and lets you know what is possible.
So I don't think the folks who are not participating in the Postal matches, do not have poor computer skills. I think maybe they do not like to compete.
There are a lot of folks on ALR that are new to muzzleloaders. Some are even new to shooting. They may be intimidated by the level of play evident in these matches. There are really good shooters here.
I think these matches are fun and for me gets me out of my normal shooting routines.
The matches make me wish I had the means to go all around the country and even North of the border and shoot with all the fine fellows that shoot these matches.