Padlock does not block actions on blocked layers, ends up being useless

[Bruno Henrique]

Padlock does not block actions on blocked layers, ends up being useless, in addition to disabled layers

Edited July 27, 2019 by Bruno Henrique
Forgot a detail

[HVDB Photography]

According F1 (Help)  :
 "Locking is useful when you need to prevent a layer from being moved or transformed unintentionally."  = i.e. on the canvas
Though, one can still move it up and down in the stack.
"Layers which are locked show in the Layers panel with a lock symbol next to them. Selected locked layers appear with crosses around the bounding box." 
And  indeed, transform is locked.

But one can still make selections, apply adjustment etc.

 

Edited July 27, 2019 by HVDB Photography
added som extra info