Yes but going for Lib tends to SLOW down my win time, I'd rather just go for Steel after my Treb conquests, and taking out the rest of the AI with random crap and lots of siege. All you need to win is Cannons and random junk to take cities and protect your stack. :3 I tend to be much more of a warmonger than most people on CFC, I have like 5 Space race wins on my HS out of like 500 games.
But if you're in a position that you can start to blow out the AI in tech getting Lib is fine, but there is no reason you should slow down your win for it. It's really a trap, you can get Engineering and Civil Service, and win the game quite a bit faster than trying to get really far ahead in tech so you can get 1 free tech.
I used to always for the super strong Workshop/Watermill production base, but then I realized I was so far into the tech tree that I was losing 200-400 years on my finish dates, and just started whipping Trebs, Maces, and Pikes in the early ADs. But it really all depends on the start, if you have a super sick start where you can just explode in tech and get more than enough cities with out war you are better off going to Lib and taking Steel or Riffling with and starting your end game war then; but with all the mediocre cramped starts you usually get just start your endgame war a lot earlier with Medieval units.