Glory of Hercules? What's it for?
I don't know why you're supporting pikmin.
And, even if the process is continuous, you need cells to hold and deliver that to where it needs to be used. The process is one thing, but you have to take that usable energy/oxygen/whatever to where it's needed before it's useful and in a multicellular organism without a circulatory system, that can't happen.
That's like saying I don't need a stomach because as long as I always eat I'll have energy, which isn't true. There has to be a place for all this to occur.
The processes that you're explaining take place in cells, if the cells don't move from that spot, then that energy/oxygen/whatever is produced for use, can't be used where it needs to be, it'll just be there while the other areas tire out and die away.
Or if there is no circulatory system, there are no cells, and with no cells, these processes can't happen. So there must be cells, therefore there must be a circulatory system, and you cannot function without energy/oxygen/whatever being taken to all parts of your body being a multicellular organism, and without a circulatory system you couldn't meet that requirement, therefore it must be present in that sense as well. An immune system must be present because of all the contagions and bacteria over the ground they walk and the air, and porous skin. Without the immune system, they would die of those contagions. With the immune system, it attacks any foreign cells, and since the animal immune system would recognize the plant cell as an intruder those are destroyed, eliminating some of the life processes the pikmin need to live, therefore killing the pikmin.