I have to say that I'm not surprised regarding the outcome. Liverpool could always score 3-4 goals if everything went their way.
This is where the coaching comes in though.
Barcelona went out yesterday because of Valverde's and his coaching staff. They opted for the same team in the return leg despite the fact that Liverpool were better for 70 minutes at Camp Nou.
They knew Liverpool would attack the spaces behind Sergi Roberto because he lacks pace to deal with the long diagonal passes. It also pushed Barcelona further down the pitch because SR wouldn't attack out of fear of being caught out. It was a different story when Semedo came on.
The second error is connected to something that Valverde's failed with since he joined Barcelona: a lack of control. Barcelona not only fell into Liverpool's "correcalles" (up and down) type of game but also failed to win it. Partly thanks to Alisson's ability in goal but to 90% because Vidal/Rakitić were playing instead of Arthur.
Arthur is the best ball holding midfielder at Barcelona and he would've calmed things down like Modrić and Kroos did for Madrid against Atlético Madrid in 2017 when they went down 2-0 after 15 minutes.
Klopp, meanwhile, managed to get a maximum effect from his substitutions because he saw there was enough space for Gini Wijnaldum to actually exploit his qualities.
Good analysis as usual. [emoji106]