I don't think it was due to lack of funds, or trying. The fact is that the transfer window after a major championships are always more chaotic. This hasn't been helped in appointing a new manager, and a new director of football who both took time to get settled and identify targets. This meant we are behind other clubs in terms of setting up transfers.
Yet despite this we have got a better defense now than we had before the window started, we have a stronger midfield, and we are stronger in attack (although not by much). Did we get who we wanted to get no, but we didn't get screwed over paying way over the odds for Gabbiadini, or God help us sign Sissoko for £30 million pounds.
I fully expect us to sign the players Koeman wants over the coming 3 windows, as he always said it will take 2 years for him to get the squad he wants. Expecting to be done in 1 crazy window is just naive.
Morishi has got Koeman, got Walsh, and by all accounts getting us the stadium we need, so I'm going to trust that he will give us the players Koeman needs.
Faith my friends, time to cheer the club on and have faith.