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how do you mean?

Well, on Steemit you can get a lot of attention just because of the tag you use. Users often scroll threw the "new" or "hot" section of famous tags like: Steemit, introduceyourself, photography etc.

Using a unique tag on our post could cause problems because new user can't find our project because they don't see the post.

Ah yes I get what you mean, the thing is as you can choose different tags for your post, I think its 5 right? Then only one of them needs to be the unique one, it then means that it is a central place to go where are all of this group ones are posted, yet they can still appear in all the other 4 tags too, makes sense?