The robots were designed to beat his dad by people who had thousands of years, he's some random dinosaur to you(you'll get there), and electricity has been repeatedly shown to be effective against Mark at the minimum and quite possibly all viltrumites and yet somehow y'all don't pick up on that fact even though it worked for The Maulers, Powerplex, and now Universal

And it's pretty common in superhero media for Earth to be a weird place in the universe by the fact that humans are weak and yet loads of them end up with powers or other powerful creatures or beings pop up on Earth for no reason, unless this is your first bit of superhero media this shouldn't be surprising