While your point stands true, one of the cardinal sins of decision making is letting outcomes dictate your evaluation of a decision.
It was, even with hindsight, the right decision to let Neymar go for ?222M. Absurd amount of money for a player who let's face it, has gone downhill and would most likely have continued his downward spiral with us as well. That we then blew it in the worst series of transfers in the history of the sport is another unrelated and pathetic decision, which we should hope to never again emulate.
But back to the point, yeah, given that as a club I just don't think we have a mature decision making team on transfers, even though Barto is gone, and thus I wouldn't trust them to make good use of the money either. Let's see if Xavi has any impact on getting some good transfers in, but that is highly unlikely. He's been in Qatar, I doubt he knows much about young talents in Belgium or Germany.