Absolutely this. We saw this clearly in the lead up to his first driver's championship. Everyone maintained we were seeing a more mature, more sportsman-like Max since then, but instead he just didn't feel any pressure over the last few years. He still drives like a pissed off teenager and makes it clear that every time you try to pass him, he'd rather just force you out or crash into you, no matter what the circumstances.

He's a fucking immature asshole. Always has been. Likely always will be.

He was 0.63 seconds below the minimum, over a half a second

If he was off by less than a second as to when VSC would actually end, he would have ended up above the minimum time before he could slow back down. We have seen countless sprinters jumping a start when they are held for longer than usual time and it was not because all those people crumbled under pressure.

he was overly focused on being right on top of Piastri rather than his margin. Max appears to get more reckless under pressure.

Well you always take more risks when you have the 'slower' car than when you have the quicker car. Max raced the Ferrari differently because he knows he can have multiple attempts to pass Charles. Against the McLarens, he pushing the limits to try and gain any advantage. Often results in him going over the penalties and some the incidents (T7/T8 in Mexico) were way over the line but I would rather see someone pushing the limits rather than just accepting their fate.