The changes are great, I think that it provide much more interactivity with the users as well as less chance of spamming one deck. This allows you to really try and find new decks to win, which greatly adds to the experience gained in terms of knowing what cards to play for which splinter and at what mana. It also allows everyone to showcase their skills at some levels, because without knowledge of what cards to play, you won't get too far...
As you explained as well, showing how many cards are needed to lvl up was a great move by the SM team...
RE: Welcomed Changes & Giveaway - A Steem Monsters journey beginning from a Starter Pack - Act 7