It's what happened during the week that changed the mood. The rotation continued to slide backwards, the hitting did too, the Jays split a series we thought the Sox would take (3-1), Bloom made no moves to bolster the pitching and could only come up with an injured outfielder (the Sox need a hitting first baseman) to help the lineup, and the Rays beat the Sox 7-3 and, worse, 9-5 in the Trop, the latter game with the Sox ace Eovaldi getting smacked around--as was Ottavino, Barnes' set-up man who is paid more than Barnes. Oh, and bring-up infielder Arauz had 2 errors last night.
To me the bad week fits the worst case scenario: the rotation sucks so badly the hitting can't make up the difference, and Bloom has signaled that this is not our year.
I am more pessimistic than you because I just don't see how the pitching is going to come around, but I also am grateful for a superb first 2/3 of the season, which was completely unexpected.
And this. Our two hotshot rookies, Dalbec and Duran, don't look like they are ready for MLB.
I also agree with moonslav's analysis of why Bloom didn't go after a really good starter: JH didn't want to go over the luxury tax limit, and Bloom didn't want to give up any of the Sox best prospects.