Good point, however I think that is OK as long as both do what they should. Node age and relocate etc. will separate them into different sections, Elders in their own section will separate them as well and so on. It is related to Sybil prevention and works in this case as well. If nodes do that I think we are fine, they may be taking risks though.
I think it could be seen from different angles. I am replying to a huge number of posts right now (internally) so wanted to give some context here. Hope it helps.