I'm a very casual participant on WikiTree who just discovered FamilySearch, to give you an idea how untutored I am. I embrace the wiki philosophy -- be bold, make a small change and someone else can build on it, etc.
I've been putting FS links in profiles, with the intent that I or someone else could port more extensive info from FS as time allows. By "We should not be encouraging people to use FS trees or profiles as sources," do you mean
- I shouldn't put the links in here at all unless I have time to consult primary sources?
- Links to FS profiles or trees are OK but not in the Sources section?
I'd hope there's not a high barrier to constructive edits, even as simple as linking a FS page for later digging. IMHO the real key is exercising good judgment, treating something like FS itself as a secondary or tertiary source and understanding it's not a primary source.
But I'll go with whatever the community deems appropriate.