Yes, Lahoz was a big factor (and is a waste of sperm, as I said before) and he possibly cost us 2 points.
But even if we won 1-0 with this kind of performance, it would be undeserved.
I agree. The problem is, yes it can happen that you got a bad day and an undeserved win,..or a undeserved loss (unlucky day); but unfortunately this is not our case.
Something is broken in our system that led us in a comfortable position.
Till some weeks ago our system worked well, we lost in attacking power, but we were more balanced (midfield and defense), as Messi explained very well when asked about Neymar departure:
"Neymar's departure has changed our way of playing. We lose lots of attacking potential but it helped us in a defensive sence. Right now we're very well armed in the centre of the pitch. We have more balance and that makes us defensively strong."
EV, with the available material, did a very good job.
But now that system doesn't work anymore and it is more and more evident.
Unfortunately this happens precisely in the decisive period of the season....
Obviously, it is not easy and it is risky to change a proven system just in this period of the season (without having experimented and tested it several times), but for sure he could give more time to Dembele and Coutinho, and more rest to Iniesta and others players.
For me now, seeing the situation, he have to take some risk.