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Staked STEEM would be the same currency, similar to how STEEM behaves within the savings feature. Steempower aka vesting shares is a completely different currency.

I don't think the typical end user would see any difference other than the word "Staked" used instead of the word "Power". I'm not at all convinced one word is better than the other.

Most already perceive SP to be the same currency as STEEM in the sense of 1:1 value plus a little interest.

I actually don't mind the word Steempower, but is there actually a need to have a separate currency in the form of vesting-shares?

Having that we might make the next step and introduce the internal Steem/SP market, which should remove all the frustration coming from the longer lock up period.

This seems like an elegant, and almost weird loophole, would this make Lock up almost semi-irrelevant?

Yes, that's the idea)

Less confusion for new users, I would imagine. "Staked STEEM" is a lot more intuitive to a new user than a whole different name for the same thing (SP).