I am not sure those buttons are needed at all.
As you say, CTRL+A selects all and once you have your selection, you can just click on the icons in the list.
However, if there are buttons, then I think the separate buttons are better than a toggle button.
Say you have 5 or 6 layers already selected.
With a toggle button, depending on it current setting, you would have to possibly press the button twice.
If already set to deselect all, you would have to press it once to select all to then press again to deselect all.
Same for lock/unlock and show/hide.
With the separate buttons you just select the one you want.
But as you mentioned you probably don't need these buttons at all.
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