As you may know, Vegapunk used to be part of the scientific group called "MADS".

https://scans-hot.leanbox.us/manga/One-Piece/1017-011.png

https://official-ongoing-2.gamindustri.us/manga/One-Piece/0840-003.png

If you look at other members of MADS, they are all decent fighters. Queen is a yonko commander, and while Judge and Caesar are not exactly high tier class combatants, they can certainly defend themselves and would smoke pre timeskip supernovas and have a good chance against yonko officers.

So if they can kick ass, why can't Vegapunk, being their leader and by far superior scientist to all of them combined, be a world class combatant?

He can enhance his body both genetically and mechanically to a degree Germa or Queen could never dream off, and Vegapunk can have lots of hax Caesar would be jealous of.

I believe Vegapunk will surprise us all with his incredible power, what do you think?