El Gato
Villarato!
Sure, lack of bench is one thing however it is by no means exclusively a Liverpool problem, we (Barca) and some are even worse, I'd argue. Perhaps only you guys and City (?) are better in that regard.
With regard to crosses, it is the most effective way to break down a bus or playing against an ultra-defensive team like Atletico. I wish we Barca would use it but we have neither the players nor the tactical flexibility/versatility to do it. That said, I think Liverpool was not resorted to making just crosses though, they played fast counters a few times yesterday as they probably have the fastest defensive-offensive transition among all elite teams.
I can't predict how they will fare next season but I think they should be fine, among the top, top contenders for all trophies, even without major reinforcements.
Our bench sucks for what it needs to be so we can be successful. Almost each and every player we have (or don't have) there could and should be improved upon. There wouldn't be issues of overdependency if we had a good bench. At this moment we have a loanee keeper, no RB, a rather green CB in Militao (which is OK), an old LB (which is not okay), a very old RCM (which definitely is not okay), an RM in Vazquez who I love but if anything he's a deep fringe player at best and shouldn't be in regular rotation as he just doesn't add anything in attack, and a striker who either sulks or sucks.
City's bench has issues too.
Liverpool's issue with the bench in my book is that they recruit for plan A only. 20-23 of the same type of player. Their plan B is plan A with more legs. And this way they'll never have a moment of unpredictability that is necessary to remain a dominant side. Guardiola was able to ride this build for 2 years and had far better players, far better. And still Mourinho was able to not only compete, but eventually beat him. If you can't deviate and be pragmatic in certain moments, if you can't recruit players who embrace the main style, but are also creative enough to do things differently, you're doomed long term.