Bend Tool selection names is confusing

[Fonte Boa]

Without "Top Point Clamp" and "Botton Point Clamp" you will no be able to isolate the area to be deformed.

Take a look at this another video:
the intention is deform just the blue area.

Observe where i positioned "Center": this is important.
Observe too how i used "Top Point Clamp" and "Botton Point Clamp" to delimitate the area to be deformed.
Finally, observe that JUST that area was deformed: the rest rotates, but its volume is INTACT!

In your last picture (as the anterior two ones too), you are performing a Bend | Plastic Bend operation, not a real Bend Clamped | Clamped Plastic Bend.

Try to bend just the intermediate blue faces of your last picture, keeping the rest intact, generating an "U" shape, or an "L" one (with the corner rounded): you will need Bend Clamped!!! There is no way to simplify/unify this: the two commands are enterely differents!

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Another approach to make you understand.
(i've created a text and Combine it with the bar, ok?!)

Left one was deformed by using Bend|Plastic Bend;
Right one by using Bend Clamped | Clamped Plastic Bend.

Obser how the letters at left were deformed
and how they are intact at right!