, I think for several factors, like the misunderstanding of the "Legazy" term and the very quick tests I did, but it seems that I intended this feature in the other way round! Plus the option in the preferences window seems that makes me think that I was "activating" the new feature for all new layers instead the real meaning, ufff... I'm sure too that I didn't test it in the best of the ways, so... really, have you tried something as simple as create a 4 points circle and move one of his poins far away to see the difference??? IT'S SIMPLY INCREDIBLE! 
The resulting curves are simply beautifuUul! 
Over all when you compared them with the old ones... Well, that's all, it's simply I had to put it here cause when I tried, I feel like a little disappointed with such a promising feature and sure I have not talked about it as well as it deserved, so THANK YOU very much for another great feature which (now) I've suddenly fallen in love!
...I mean, each time I move a point and see how the curve "turns and deforms" in that harmonic and rounded way, offering more complex and at the same time beautiful movements than before... I really start to think that someday I'll get that other "Bezier Tangents Issue" out of my head too! And little by little (if no too late) maybe some things will become more simple and easy... or I hope so! 