After route is created, it offers Uber alternative, with faster time. It seems helpful, BUT! It plans routes with more switches or plain longer routs than could be, so that people would decide to take uber instead. It planned Route from city centre to Versailles with 2 switches (50 min) and showed that Uber would take 30, when infact it only tales one switch and 35 minutes overall.
Barmsy about Paris Metro Map and Routes, v2.1.2