I would argue that you just haven't seen any good stacking bots yet...
Saying that "stacking is a waste of time" may or may not be an accurate statement. "stacking is a waste of my team's time" would've been a better phrase
You may be right, but until my team gives it a go I will remain positive.
Seriously though, I was watching the VCU webcast and I didn't even see anyone attempt to make a stack. Why I don't know- probably because it's a waste of time.
The question as I see it is:
Is stacking a waste of time, or have we not seen a team with enough practice and a good enough bot to do so successfully?