They both: provide a continuing advantage as long as the designation is maintained, apply to one player at a time, start the game applying to nobody, are granted explicitly by card abilities, can be "stolen" by dealing combat damage to the current designation-holder, are printed in supplemental sets rather than standard-legal sets, synergize with several cards in their sets, are narrow, directly interacting only with cards that mention them explicitly
Energy cards are a vital part of the Pokmon Trading Card Game
All of that ignores the fact that he also has Double Strike, one of the best abilities to have in a game of commander
If the Equipment is no longer on the battlefield as the job select ability resolves, explains WotC's Matt Tabak in the official FINAL FANTASY Mechanics article, you'll still create the Hero token, although you won't attach any Equipment to it. When my Reaper's Scythe enters the battlefield, its job select ability will trigger and put the trigger on the stack
And thats really it