First a bit of background: I started playing adventures in 1987 and I have been playing lots of adventures since then.
Second: My favorite adventures are Day of Tentacle, Secret of Monkey Island 1 & 2, Sam & Max Hit the Road, The Dig, Gabriel Knight: The Beast Within, Space Quest I and LOOM.
Third: Loom is a great game, one that I can play again and again. And it is the shortest old-school adventure and one with the easiest puzzles that I ever played. I think it can be played in less than 2 or 3 hours. Ok, the sequels were canceled but that fact do not make Loom less enjoyable.
Finally, I've played Broken Age 2 times and I want to play again, the game is beautiful, the animations are amazing and the story is really good from the beginning but gets even better after the end of the Act I. So much to think about after the end, several things that seemed random are making perfectly sense now.
So, I don't care if the Act II will be the same length as Act I, as long as the good experience of playing the game remains for a long time.