Mike Noren wrote:

In marine aquaria superglue/krazyglue is used to fasten fragments of
live corals to rocks, to give them time to attach to the rock.

Does anyone know of any reason why superglue could not be used to
fasten freshwater plants to rocks, roots etc?

I know it's not done, but - why not?

Cyanoacrylate was developed for emergency wound closure in field
hospitals. That's why it sticks to your skin so well. Aquarists use it
often, for your plant application and also with ornaments and rock
structures, caves, etc.