Some ice storms/hurricane damage have made my hunting areas too thick for a long gun (gets snagged on everything), so I have not hunted with a flinter since 2005.
But as others have said, it is not as difficult as many pundits and gun media know-it-alls make out.
It does require you to spend more time just getting to know your gun and especially the lock and drill of carry, checking prime, tending the flash hole, flint care, any number of things that are unique.
But you can have success.