Tooltips with proper description is mission impossible in this area. They don’t exist in Blender. Well, everything is possible, but i would have to make every little node an extra class. Do not want.
By default the buttons are text + icon. Icon only would be a bad default here. You don’t work a dozen times every hour with it. More ten minutes every few days. If even. And so icons only is more an expert mode here. Especialy with the incomplete tooltips that just shows the Python name.