Copying of model objects

I’m used to copy model objects by CTRL+drop in Architect.
I’ve noticed that it is possible to copy e.g. fields or filters from one to another entity.
Is it secure?
If not, what operations are and what are not secure/allowed?

Copying filters to another entity is not safe and it is actually a bug since filters have connections to fields in the current entity which cannot be easily replaced when copied to another entity.

Otherwise everything that is allowed should be safe.