You lucky thing! - I'm still using CS2
(< not really, as it does me quite well).
From the rest of that paragraph, your conflict (the desperate want) seems to stem from a dissuasion to then open a
2nd program for more refinements on your pics. I would say that you would have to be pretty sure that the change
would work for you. You might streamline [part of] your process, but would it "do all" for you? If so, why do Adobe
market
both LR and Pshop? Basic photography has not changed over the years between CS6 (or 2) and CC; but your
processing has (+vely). I'd say partly because you have learnt to get the most out of your present PP.
What do you do with your old system?
Now to your Qs...
1~3) No, no, and no.
Reasons: I use a different raw converter bcz I have to, and then use P'shop CS2.
The main tonal and color (US spelling bcz program is from there) changes are done
in that raw converter; tweaks, geometry, etc in CS2.
Good luck with your dec
ion.