Let me preface this by saying: I do think team cohesion and chemistry matters and does get undersold by the analytics/advanced metrics crowd (which I would consider myself a part of to a degree). Everyone pulling on the rope and buying-in, to borrow a favorite Hitchism, clearly matters. I also believe that the general vibes around a team are a bit of a chicken-or-the-egg situation. Is the team winning because the locker room is in such a good spot, or are the vibes so good in the locker room because they're winning so much? It all feeds into it.
Having said that, I think that it is easy to handwave away larger issues by attributing poor play to a lack of "effort" "heart". Go into any GDT - Blues or otherwise - where a team is playing poorly and you are sure to see posts calling the team lazy, they don't want it enough, etc. It's an easy first reaction that requires no analysis and basically cannot be refuted. This isn't to say that a team never comes out flat, or that they never look like they'd rather be anywhere else than playing, like, the Blue Jackets on a random Tuesday in February. It's a long season and that will happen, and I think to some degree, particularly in the condensed schedule, we saw fatigue impact hustle/effort plays. It seems right now a combination of things are happening in that guys are not executing, which I have more faith in coming around, and that there are larger, scheme-related issues - particularly in the defensive zone (
@Majorityof1 had a good post about this in some thread, but I can't find it rn). The defensive scheme is either designed in a way that is not maximizing the - admittedly flawed - group currently here or the players are not executing it. Either way, the results are ugly. Those scheme and personnel issues are the more concerning bit and the ones that are going to be harder to fix. This is generally the other side of the "death of 1,000 cuts" mentality. There is no singular talent(s) in this group that can go win you a game when things are going poorly. I was/am lower on this roster than most here seemed to be, but even I thought they'd still pretty comfortably make the playoffs. There is still plenty of time, though having said that, you can't bake in too many 5+ game losing streaks into the season, regardless of when they occur. I don't think they will be this bad for the whole year but I think there is enough reason to be concerned about a team that wasn't great 5-on-5 last year and shot a full percentage point better than the next best team which relies heavily on a group of pricey veterans that are all another year older looking totally lost out there for big stretches.
And, just as a final note, David Perron is one of my favorite Blues ever. I still have one of those alternate jerseys with the big circular crest w/ Perron on the back from his first stint. I wish he were on the roster still. But, he signed with the Red Wings on July 13th. This team had all of UFA, training camp and preseason to most effectively process/manage/offset his loss. If it is a contributing factor to the team's play heading into November then, yes, blow it all up and save folks a lot of time and money.