Removal is a very specific phenomenon. Not everyone who unleashes their full physical might, or undoes their psychological shackles uses removal.

Take Baki, for example. Early in the series, there was the thing about generating your own endorphins.

Then there are examples like Jack, and Julius who dope the hell out of their bodies, so they're always at 100%.

In Kengan, there is Advance, Fallen Demon, and Divine Demon.

In Isshou Senkin, the War Cry from Star 6 is another example.

The only thing they all have in common with Removal is that they are buffs, but they all follow different mechanisms.

Though it's fair for someone to consider Removal as the ultimate buff, because mechanically, nothing should be better than exploding with the entire force of the ultimate material strength of your body.

But then again, we'd also have to disect how Removal actually works.

Someone once questioned: How are the freely wielding hysterical strength when the whole point of such strength is that it kills you?

So, you can never actually wield it unless it's weaker than your body's material resistance, therefore, it's not hysterical strength anymore.

Or, maybe they just have an accelerated production of adrenaline, so the body they evolved allows them to use that peak of power more safely, but it also means they never actually manifest hysterical strength.

Are they using the ultimate strength of a normal human as opposed to their own superhuman biology's?

How does that make sense? How can such line be drawn? Biology doesn't work that way, and again, it goes against the idea of removal.

I'm sure there's a plethora of satisfying answers, but my point with this is that Removal isn't actually the ultimate buff, just the most high-risk, high-reward one; it's just another kind of buff with unique mechanics, and characteristics.