So one can work on complex shapes without them interfering with each other, or causing problems for making selections.
Sean Blezard commented
When you group shapes they kind of become layers - in that when you go into edit them it stops you changing any other groups or shapes.
Maybe just lock icon where you can lock a layer....and access to the unlock layers clilick on the lock to unlock the layer later if you want to edit it
I can’t stress how much the importance of layers when it comes to design. They are very important feature to be able to control your artwork
Christopher Archer commented
And layer locks