I don't think the tags are there for the settled scientist to give a % mod, but if the academy only gives 10% then it might be better at that point to settle them where the academy has been constructed - might also make the academy balance better with other options like getting an immediate tech. Seems like not much but round after round, it's a lot, particularly with larger cities, specially for a bonus building. Then if you settle scientists in the same city, you are adding base to then also get that additional 10% so still supports specialization while keeping diversification nearly as valid - 10% in another city yet might still be better than the Scientist's settled +% benefit in a specialized one.