Isn’t that more like, he’s actually using technique and finesse if he fights calmly? I don’t really see it making him especially weaker then stronger then he’d otherwise be. It also seems more likely that being angry makes him stronger, because well, look at dragon balls history.
No. Toriyama has
explained how Ki works: "In battle, the
most important thing is the
size of your ki, and your control over it.
Ki as a concept of course includes such spiritual powers as energy [
genki], courage [
yūki], and
right-mindedness [shōki]. No matter how much you train,
there are limits to physical strength, and the only way to overcome that is through ki. I think Goku was able to approach the mightiest warriors in the universe through strengthening his
ki."
The entire point of Broly's training as shown in SH and the recent chapter is to gain control of his emotions so he can actually wield his Ki properly. Without the correct mindset, you can't control your Ki properly, lowering your power. We even have Jiren appear in SH with him explained as having incredible control over his power, enabling him to fight at a far higher level, that served as a contrast to Broly especially with his reaction to Vegeta's explanation.
You bring up how anger is used to gain power and that is true but here's the thing, all of those characters had training to use that power. Gohan's entire training arc was about learning to tap into his inner potential with his rage and to wield it. When Goku goes Super Saiyan he is barely managing to keep control of his rage and later retains his sense of humanity against Freeza and so on. Broly doesn't have that sort of restraint.
That kind of a statement is iffy considering Gogeta overpowered Broly in direct clashes on multiple occasions, not to mention how anger works for power in Dragon Ball. Admittedly, they are still close enough in power that Gogeta had to dodge attacks.
That statement came from Saikyo Jump during the Granolah Saga and was written from Broly's PoV to discuss his future in the manga. It even
directly references his training in this chapter over a year beforehand which indicates it is faithful to the manga's interpretation of him. Gogeta dodging Broly's blows is a mixture of Gogeta's superior skill and Broly losing control of his own power.
Anger can increase power, sure but it results in a loss of control. Hence the need to practice that power. This is even an entire point with
Cell Max who Toriyama states would have been unstoppable, but instead he's just a rampaging uncontrollable monster. You can interpret Broly being able to defeat Cell Max whichever way you prefer (Broly has gained more control via his training or Broly just has more raw power than Cell Max so he wins in a berserker clash).
It is
very clear that your control over your emotions heavily influences your power. Pure rage like Broly or Cell Max is actively detrimental and prevents you from using your full potential. Broly's raw power matched Gogeta Blue's raw power but he lacked the control to wield that potential, hence being beaten down brutally. It's the same deal with Gohan Beast vs Cell Max (although Gohan is clearly stronger the dynamic is similar).
-
In short, in Dragon Ball, your power is incomplete if you lack control over it. Rage can increase your power but it tends to decrease your control which makes the power less effective. That's why characters that use rage-based transformations, like the Saiyans, need to meditate or learn to be relaxed while transformed.
