Originally posted by Luminatus
YouTube videoMind you this is Base Goku. It took Super Buu and SSJ3 Gotenks to blow away a dimensional wall back in Z.
You can't compare that to the Hyperbolic Time Chamber breakout, for 2 reasons- first, the Hyperbolic Time Chamber and Seguroku Space appear to have different rules (an energy blast wouldn't work in the HTC because it has no physical boundaries, whereas Seguroku Space does, apparently) and second, Buu, Gotenks and Piccolo didn't break out by using their power- rather it turned out to be a matter of harmonics, like breaking a glass by playing its resonance frequency loud enough.
So I don't think that demonstrates Goku as any stronger than he was before- remember, even in their natural state, he and Vegeta were far stronger than the Supreme Kai anticipated could be possible (and also many times stronger than the Kai himself). If the supreme overseer of the universe couldn't foresee the potential of the saiyan race, then it's a fair bet no one else did either (except Freiza, as it happened)- so the dimension was probably not designed to withstand even moderate attacks from fighters such as Goku and Vegeta at EoZ.