I think base game should give more options with good mechanics, then modders can make great content and add those Focus trees (I don't like those focus trees at all.. I think it isn't interesting thing).Dont ask for new content - apparently only an update of whats already available by modders is planned... ok with the difference we shall pay for it.
/sarcasm off
But I don't think that mods can change game mechanics and how research are working.