Someone very smart wrote before the season: "Breitenreiter, what were they thinking?". I think he's not exactly the best coach and he also was a terrible fit for Hoffenheim, who in my opinion need a progressive coach. So I don't think it's a huge surprise that they are having a bad season, even if they did have a decent start initially. In hindsight you could also try to poke some holes into said start, for example of those 17 points 15 came from wins against Bochum, Leverkusen, Augsburg, Mainz and Schalke. Teams, that themselves had bad to abysmal form at at the beginning of the season.
And I'm sorry to bring this topic up again, but I actually think their plastic status has a significant impact on this. Because, as you mentioned their squad isn't actually that terrible, so the reasons for their under-performance - especially now that Breitenreiter is gone - have to be in no small part in the realm of psychology and mentality.
And I don't see how players can be entirely immune to seeing for example Bochum "get high on" Grönemeyer before the match and then take that buzz into the opening minutes and then they turn around and see about 5 fans in the away block. Against Augsburg, Hoffenheim sold an impressive total of 120 out of 2500 tickets for their standing area, while Augsburg largely sold out their allocation.
We're at a point where the league has to do something about this, maybe it would be better if away tickets were sold block-wise to the visiting team itself, so we'd either have the visiting team pay the price for their lack of fans or at least give the home team the opportunity to sell the tickets to their own fans.
And while we have learned in this thread that private owners are happy to pump their own money into their cubs for endless growth, Hoffenheim's transfer balance may also be worth a look.
19/20 +€66m
20/21 +€13m
21/22 +€850k
22/23 +€40m
So from a player perspective:
- they stick you with a shitty coach
- "someone" seems to be constantly taking money out of the club, instead of building the squad
- they sell your (perhaps) most talented attacker in winter and loan a bunch of flops from other clubs "to turn things around"
- these days support largely consists of empty plastic seats, who don't tend to make a lot of noise
So why should they give a feck about what's happening to the "club"? You can see a similar effect at their fellow plastics, when it rains it pours, if the season goes bad it goes really bad, all the way down to the double digit ranks.