Years in the aquarium business, here's a fact......Moss/algae grows in absence of plants. I have heavy planted fish tanks which have ZERO algae/moss issues as the plants use up the resources and starve out the algae/moss. The stringy green moss is an algae and not a plant, slimmy algae, well that's a bacteria. Removing the plants out of the system opens it up to these problems which then get worse as they try to figure out how to control it when it was naturally being controlled by the very plants they removed. Yep some are book smart, but dumb as a brick when it comes to real world experience. When I was small, ponds had weeds in them, they were a pain to fish because I knew nothing about it. But the waters were clean, the fish stock healthy, and there was no green stringy algae and a resident duck population. 30+ years later, concrete around the pond, maybe a dozen ducks call it home year round, issues with algae although they didn't treat it last year and the grass came cleaning the water and so far this year the algae is not an issue. The ponds where they try to control plant growth with copper sulfate, hairy green algae, fish die offs, off colored water instead of healthy plant growth, clean water, and hence a healthy system. Bottom line, if you remove the plant growth you open the door for more issues which then cause more problems. I can understand trying to control/trim sections and keep it in check, but trying to remove ALL of it is costly and just causes more issues which then are even harder to control when nature does it all by itself.