Contradance still locks you for more than 2s in place in order for the LB to go out, same as before. There has been literally zero changes on the lock animations on that LB.

7.1 makes it that the charm effect only goes out at the end of the cast and not at the beginning, which means that all targets you would have instantly charmed have the opportunity to get away and dodge it. Before you could still get away with a backflip, but you'd end up charmed, so I don't think this changes too much of anything there, especially since the LB can catch people getting in during the cast which wasn't possible to do before, so it evens out somewhat.

All in all the LB has stayed very similar, is used similarly, and the true indirect buff to it isn't found in animation locks but the complete change of Miracle of Nature, which was a full hard counter to it before. On the other hand, Purify being reduced to 3s actually hurts the LB equally as well because 3s is too short and you have around 1s of vulnerability now when casting it (1s of Purify precast then LB activation with 2s++ of animation lock), and in spite of lining it up perfectly I've ended with times where a lucky stun sneaking through before the charm reset could be done.