Maybe you are right, but I think humans are blind to any behavior that happens at a frequency either too low or too high.
If an organism responds too far out of our frequency band (on the order of hundreds of milliseconds), especially on the extreme low end, we seem unable to consider it 'intelligent' or even purposeful.
We barely even notice it and if any behaviour that unfolds over days seasons or even years.
It also doesn't help fungi that mycelial networks are almost all underground where they are literally invisible to us.