Everyone's intro to muzzle loading's different. One common denominator is that we all got into it and continue because it's FUN. Old guys like to tell stories about stuff that happened 60 years ago and that's valuable, but that time has passed. One basic difference is simply there are far fewer opportunities to enjoy muzzle loading with like-minded folks today.
Might be hard for younger people to visualize, but for years there were enough informal "shoots/matches" held that from spring to fall, we could find an event every weekend to enjoy. It was FUN and all ages, genders, skill levels, etc. were welcome. Wasn't always "clubs". County fairs, church picnics, Lions' Clubs, etc. held them. We made a lot of friends, too.
One difference I see today is pretty simple. Modern in-lines have taken over the market, yet they are not welcome. If we truly wish to see muzzle loading continue, those matches might see a revival if inclusion were possible. Don't envision allowing them to compete with traditionals, but it's a simple thing to set up matches to encourage all muzzle loading folks to join in the fun. Anyway ...just a thought.
Pretty hard for a would-be muzzle loader to start out with a traditional gun when there are none on the shelves to purchase.