It makes no sense that you cannot teach
teaching uhmmmso I think that the bonus you may give depend from your profession but from your speech skill too(under 100 ) nothing100 - 150 a little bit150 -200 more200 - 250 moreover 250 very much ( so maybe we will have another skill back in the game)
Should also be based off your INT as well because a dumbass can't teach.
Those requirements might be a little steep considering the profession requirements are still needed and that with 250 speech is near impossible.