Bridge Officer Training Revamp - No skill level?

In the old system, in addition to spending expertise on new skills and Promoting your Bridge Officer, you also spent Expertise to "level up" each BO's skill. This was consistent with levelling up your own skills and provided a sink for Expertise.

Under the new system, you only buy new skills as Training Manuals and Promote your BOs. There doesn't seem to be anything in the interface for levelling up skills. Am I missing something?

On the new system you do spend Expertise on the new skill, but I don't think it's as much Expertise overall as the original cost. Are all skills under the new system equal to a fully leveled skill in the original system? Or have we all reduced in effectiveness because our BO skills are all less effective? If not, this is a great advantage for low level players since they get fully levelled BOs for free. (Or the unlocked abilities at that BOs rank anyway)

I'm not really complaining, just... uncertain. I do like the ability to switch out previously trained abilities, although I don't see myself making use of it. That's the reason why I have a big crew. However, for a free player with limited slots it can help in manning multiple ships.