Note: Do not repost the full translation. Please paraphrase and link to this translation. For additional information, please read this post. This translation is for fan use only, and may not accurately reflect the opinions of Masahiro Sakurai.
(The reader asks Sakurai why Wario’s Shoulder Ram was changed to a punch in Smash for Wii U/3DS)
You have a good eye! In summary, [I changed it] because I wanted to make Wario stronger. As I was making Smash for Wii U/3DS, I wanted to improve Wario, but his Shoulder Ram was a body blow; essentially, the attack was a moving hurtbox and was easy to mess up. There was no reach, and it was a difficult attack to use without Wario stepping off the edge. Since Smash attacks—especially Side Smashes—often decide matches, I changed the move in order to make Wario stronger.
If I only included things true to the original source material, then there would also be times when things wouldn’t mesh well. I always reflect on things that went well and things I want to improve with every Smash, but I think it’s most important to prioritize a game’s enjoyability!