From what I've seen I think these changes clearly do not address what they state they want to adress. If you want to challenge yourself on higher floors all you get is a middle finger, because by the end of a difficult floor (15-25 minutes of strategic gameplay) you have usually a 50-60% penality, even if you hurry up. Especially when abiltities can kill you with <=3 hits this means you get butchered considerably faster because of these.
I also think they are utterly unneccessary. Lengedary progression is hardcapped anyway, their statement is objectively false as given by the blue post, because waiting 10 minutes for bloodlust is not the ideal way to play the game. You are already in your fun zone beyond the reward structures, if someone wants to show of how good they can camp a floor for 12 hours, let them. It means nothing. This is just people wasting their time, in fact at this point Blizzard incentivises not taking breaks.
If anything Blizzard should make sure that the mob scaling does outpace the players at higher levels instead of currently giving people a harder time to start and then snowball out of control (at least I guess that is the ultimate goal of the final product). They adress an issue that by all accounts shouldn't exist in the first place. People might be willing to put up with waitng for a BL right now, because they know once they make it past this hurdle it gets easier. If it only gets harder this becomes even more of a non-issue.