You're wrong for the following reasons (not exhaustive):
1) Firmino has an incredible track record of scoring important goals for us; that doesn't just go away for ever; ...
2) Firmino does so much more for the team than just score goals; by removing him you lose that.
3) If he doesn't play then who does? It's not like there's some ready made super-duper replacement who is being prevented from playing by Bobby starting. Origi for all his heroics is not that player, and he does not do half what Bobby does. Minamino is not yet that player either. If there was another player who was unfairly being kept out by this player then you might have some semblance of a point. But there isn't. In many positions we have to make do with what we have.
It's easy, when angry or frustrated, to yell ''take off X'' but then what? Football support should not be about taking ones anger out on players, even underperforming players. Otherwise you get your moment of vengeance and then what?
4) Jurgen Klopp is fucking boss. He might just know w thing or two that you and I do not.
1). I never said it did. Of course I am delighted for his goals that got us through the CWC and all the away goals he's scored to help us win the league this year. Me thinking he's been wasteful at Anfield (and probably a little bit too protected by fans and even Klopp) doesn't change the fact that I think very highly of him otherwise. Look at Divock Origi and all the amazing things he's done for Liverpool. But if he has a bad game half the world starts yapping about how he's not good enough to play for us.... By the way, that's NOT what I'm saying here about Firmino: Yes, Bobby scored a much-needed goal to put us ahead tonight; I just wish it had come a bit sooner. I wish we never had to go to extra time because most of our players played such a high tempo game in the first and second half, they were bound to be knackered. In the first half Bobby seemed to be half asleep to be honest.
2). Everyone knows Firmino is not a traditional #9 and what he does for the team is indispensable. But let's not forget that we have also won games with him and Salah out (e.g. last year v. Barcelona and a few PL games where we were battling for head-to-head with City for the league). No player should be made to feel too comfortable ... like they are irreplaceable or something. That's when complacency creeps in.
3). Seeing as though we really needed to win it in 90 minutes, I don't think taking Ox off was the right answer. Think he had the most energy during the match and might have offered us a bit more going into the final stages of regulation time. Who should have been taken off instead of him? Well, I felt it was Bobby, but then he scored in extra time, which in theory makes me look like a tit (not denying that I am one, but I still feel we needed that goal sooner).
4). Well, that goes without saying, but opinions are opinions. Klopp himself said he wouldn't have bought Salah, and looked how that turned out. Plus, people on here disagree with some of Klopp's choices all the time. It's called being a fan. We don't have to be sycophantic, and we don't have to treat our favourite players as if they are beyond criticism.