I don’t understand the logic behind that default. Why shuffle by default rather than play in order? It’s good they’ve fixed it , though not sure it should’ve been fixed just because Adele tweeted them!
And the answer is that it’s a consistency thing. Playlists usually make more sense when shuffled and there’s some value in making sure the big green button has consistent behavior whenever it appears. Without a good reason, like a high profile artist complaining about it, there’s not much motivation to change it.