Dark pit would probably be like Fukua of smash if I made a comparison to something in terms of clones.
So entirely different specials but the exact same normals except for exactly 1 normal that is different?
And I hated him for all that as well! 15 year, and he still got away with this?
Ness should have used his own PSI moves and became physical!
Zelda should have not been playable at all!
...Greninja could have used water swords in his source material.
Really, I... ANYONE can created a moveset more unique and creative than Sakurai without botching the character.
Oh wait are you actually being serious? I would not have guessed that.
Ness using the PK abilities lets the PK moves from Earthbound get represented without randomly throwing in Paula or Poo in as a playable character. It made for an interesting moveset too.
Robin having dark magic represents the dark magic and fire emblem without having a random blackk mage(Tarja I guess?) as their own character and lets him match the 4 magic types of awakening with the 4 special moves. It fits really well.
The Godess spells make perfect sense for Zelda even if she doesn't use them in her own game, and why shouldn't Zelda be playable?
Also, Greninja could have used water swords in his source material? And there's also no reason in canon why Ness can't learn every PK/PSI spell, why Zelda can't learn the goddess spells, and why Tactician Robin can't learn dark magic(in fact, he can in canon! Several support conversations in Fire emlblem involve characters learning magic/weapons that their class can't learn. They just can't use them in gameplay) . They just never do in gameplay.
More accurate to character=/More creative, better, or more inspired moveset. Like you said, ANYONE could come up with a movelist for say Ness or Robin that stays very strictly confined to their in game abilities. You could make one, I could make one, a 5 year old with a crayon could make one, Sakurai could make one. Doesn't mean they want to, or that it's better. Even a lot of people who hate Sakurai are all for borrowed moves.
Sorry, got into a bit of a rant there.