You get random legendaries just like it was before they updated it. You can however save 40 packs, disenchant a given legendary and then open the packs, forcing the exact legendary you disenchanted to appear . This essentially lets you choose your next golden classic legendary.
Except when you just open the regular non-golden legendary you just disenchanted.
I never said it would work on the first time - should be self-explanatory that it doesn't. What I said is that it allows you to choose your next classic golden legendary which is exactly what it does. I even accounted for the fact that you may get another regular copy by recommending to save up 40 packs first so that you're never at a point where you own neither a golden or regular copy.
Agreed, but at that point, after disenchanting all the extra copies you get from the 40 packs, you can probably just craft whatever golden legendary you want...
If you’re at a point where you’re using this to choose your next golden legendary, gold/dust probably isn’t too much of a problem for you.