Realistically speaking, based on what we have seen in the last 18 months, the choice was between looking as naive as we did in 3-6 by going gung ho in the usual fashion, and looking as hopeless as we actually did yesterday by switching to a low block. I mean, the guy in charge considers low block/counter synonymous with cowardice, probably scorns at the thought of even practicing it on the training ground let alone "resorting to" it in actual football matches, while thinking that reckless gung ho football is somehow virtuous.
When he had decided to go with a low block, he probably thought this "cowardly" way of playing the game didn't require any lengthy preparation other than picking a defensive minded XI and telling everybody to stay behind the ball. It's not that simple unfortunately. Just like how you spend hours and hours on the training ground practicing attacking patterns, movement, finishing and such, you need to put in the exact same work for defending as well. If you don't expect your players to make it up as they go along in case of the former, why do you expect it in case of the latter? I can't believe I'm actually typing elementary stuff like this, but here we are.
I don't want to single out any individual player, as it's beyond clear that they're poorly coached in general and were hung out to dry in particular yesterday. Just a 60 yr old learning on the job, nothing to see here.