I guess the "sword fighter" issue is actually not an issue, as long as Nintendo think the characters of the FP will sell and has a fanbase.
Since Byleth's release, I was afraid that sakurai truly acknowledges the "too many swordfighters" argument and strived to not implement too many of them. But Sephiroth and MyRa prove that if Nintendo want more swordies, such complaints wouldn't change anything.
Good news for Lloyd I guess. Pyra and Mythra don't hinder his chance as much as some people would think.