well i mean he is good, but hes just a ripoff of mewtwo same moveset same animations. Mewtwo is way more WAY more popular . I always was confused when they just put lucario skin on mewtwo
The only move Mewtwo and Lucario share is Shadow Ball. Nothing else about them is the same.
For the new itself, most people buy Super Smash Bros. for its diverse and ever expanding roster. Saying "it won't expand much further" is honestly just bad design. I don't want to play as HD versions of characters we already played as, I want to play as new characters with new styles.