Your logic here is a bit flawed honestly. Tammy Abraham is injury prone, patchy, and far from a guarenteed 15 goals. There really aren't many better options than Hojland that were available in the market for the same money, and at tye very worst, the jury is still out on Hojland.
Onana was, on paper, a great buy at 45mil, one of the best keepers in the world last season, and Inter really did not want to sell. Few could have predicted his form being this bad. Were there better goalkeepers we could have got? Certainly, but it was hardly an unreasonable choice.
Mount is the one I really agree with you on and genuinely can't understand. We could have made Sabitzer's deal permanent for probably half the money and I'm convinced we'd have a better player. I'm at a loss to see how he's supposed to fit in to the current side (I figure he was brought in to be a hard-working free 8 alongside Bruno, but it was insane to think Casemiro could cover the ground left by both of them on his own at his age. That is definitely money that could have been better spent elsewhere.
And though it wasn't this summer's signing and I'm still holding out hope he comes good, Antony remains a baffling signing to me given the money paid.