Umm.
Prior to this change legendary engrams had a better than average chance of turning into a blue item (roughly twice the chances of turning into a blue item), some of which were ascendant materials. Now, it can only turn into a purple item, including ascendant materials. without data, we have no idea if the chances of a legendary engram turning into ascendant materials is higher or lower than before but I imagine it probably isn't higher in total, but is higher compared to your chance of getting a legendary weapon or armor piece, simply as a result of having fewer total items to roll against (all of them being decent) compared to the way it used to be.
I wasn't being serious, just a bit cynical. I had a sample size of all of 2 legendary engrams that turned into ascendant materials after all lol