OK, I admit, I'm being very harsh towards Lallana. Maybe even unfair.
In a recent press conference Klopp expressed his delight with Lallana, especially his pressing game and that's probably the main reason why he's still in the first line up. He gives us balance.
My biggest issue with him though, is that he just doesn't do enough offensively. Sure, he sometimes pops up with a goal or an assist but it's almost never when it actually matters.
4 goals against Dortmund and he wasn't involved in any of them.
4 goals against Everton, same there. And for some reason people have him in their top 3 players of the game.
I don't get it. He just frustrates the hell out of me. More often than not he winds up in the corner with the ball, does a Cruyff turn. Hold the ball, does another Cruyff turn. Looks up, decides not to cross it and just passes it to the full back. That might be just all well and good. I mean he didn't lose possession of the ball right?
But then you find Coutinho in the same situation and he takes on the defender, gets passed him maybe 7 out of 10 times, cuts in, shoots or maybe crosses the ball.
That's what I want from him. That's what we all should expect from an attacking winger. Also, it is so easy to find someone who could press and be an attacking threat.
Your points are valid, he doesn't get enough goals, but he does create space well for others. I know a lot of players can have high workrate, but Lallana does it in an intelligent way and seems like he's very quickly taking on board Klopp's ideas/instructions. Okazaki at Leicester does something similar. He stretches teams and Mahrez and Vardy reap the rewards, but he doesn't have many assists or goals. I've never been Lallana's biggest fan, but I appreciate what he brings to them and to me he's definitely worth a squad place next year (although I'd like an upgrade too, but football is a squad these days so we don't have to worry about where everyone fits into the 11). I don't think finding someone who can presses intelligently and more often that not make the right runs in attack would be easy to find cheaply.