I've been learning from the PBF mods and collective wisdom of it's members, that vegetation can be desirable or undesirable, even discussing the same species of plant. "It depends". For example, I hated the excessive FA on our pond, when it covered 75% or more of the surface last summer. But now, with just small quantities around the edges, it does provide a bit of cover. How much chara are you talking? Loads=annoyance and undesirable status; small/moderate amount=cover.

I'm sure one of the experts will be along shortly with more sound advice..

"Politics": derived from 'poly' meaning many, and 'tics' meaning 'blood sucking parasites'.