Something was wrong with Hansi Flick handling of today match. I wonder why Rafinha was substituted early in the second half? It's clear that after being replaced by Rashford, Barcelona lost its charm. And Olmo played very poorly today. At least two big chances from him could have saved Barcelona from a draw. On the other hand, Rayo was more effective in taking advantage of opportunities. Yes, even though the result was a draw for me this is a win for Rayo.
I think the criticism is quite valid. The substitutions actually reduced the team's attacking power, not improved it. The impact of this strategy dulled Barcelona's game flow. Olmo also failed to show his sharpness, thus wasting crucial momentum. Meanwhile, Rayo were arguably more disciplined and astute in their reading of the situation, so even though the score ended in a draw, they seemed more satisfied with the result.