Well, for one thing, its not called black powder season, its called muzzle loader season, which inlines definitely are.
You are correct that my main reason for getting into muzzleloaders was to take advantage of the extra hunting time. I see no problem with that, not ashamed to admit it. Some will progress in the hobby and find they like more traditional black powder weapons, some may not. It's not for me to judge either way, but I'll encourage you either way.
As for inlines not existing if they weren't allowed a special season, I think you are struggling a bit there. That's like saying modern crossbows wouldn't exist if they weren't allowed in archery season. All weapons and machinery ever invented have experienced improvements and developments that changed them throughout time.
If you like driving your model T, fine with me, I like my Silverado better.