Truthfully I don't think any of my players would try that. I meant it more in case I had a new or casual player that only had the 2014 PHB and didn't want to learn all the new rules. If I had a player who wanted to use the 2014 rules to build a cookie cutter "optimized build", I would just tell them no, and to stop being a power gaming munchkin.
I think the difference is that I play D&D with my friends, not internet or FLGS randoms. I don't need, or even want the rules to be a weapon I can use to control and rein in unruly players. I play with people that, if we have any disagreements or problems, can discuss them like mature adults. If you have disruptive or problematic players, there is nothing the rules can actually do to stop them. No mater how detailed and complicated the rules get, if you have a player that doesn't want to play nicely with others, there is nothing the rules can do to actually stop them if they are determined to cause problems.