I think part of it is having to be so conscious of protecting the back line. It's no secret that Alexander-Arnold is poor defensively, and with whichever hodge-podge of Fabinho / Henderson / Matip / Williams / Phillips winds up at CB, they can't risk being caught in possession and allowing a counter.
The result is slower / plodding buildup play, overloading the flanks to provide outlets for retaining possession, fewer players making early runs forward and making them easier to spot for opposition back-lines, and overall a pretty stark lack of creativity against teams that know to just pack the central areas.
It's a dreadful five match stretch in terms of finishing, but unless they change shape, I don't see much changing.
edit: to that end, I thought Origi actually played well today - directness and a willingness to shoot are what they need right now. I can't figure out why Klopp insists on Oxlade-Chamberlain on the wing, but I'd love to see a lineup like this in the diamond next time out:
Alisson
Trent - Matip - Fabinho - Robertson
Henderson
Wijnaldum - Thiago
Shaqiri
Salah - Origi