I believe this is exactly what EV was thinking. It could be insanity, but I like to call it bravery. It is a matter of perspective. I saw subbing off Dembele as an invitation. I could, sort of, understand that sub if it were 1-0, but not 1-1.
What is so scary about risking not losing 3 points in a competition that we won last season and we will have a chance of winning it every season?
Fair enough, like you said, it looks like we have a totally different view and perspective of the game and therefore everyone finds his opinion the correct one.
I personally would never leave a team with two midfielders and three forwards with ten men (two of which would be a huge liability when we need to press and defend)... I just cannot see how this is going to work at all.
Also, when you have players with such individual quality, you know you will always get your chances (chances that we certainly had and could have easily won that match) so I do not think at all that Valverde played it safe subbing off Dembele, that was just the only option in my eyes...