Net spend argument is flawed in judging a transfer is because not every player has a resale value. We lost Vidic, Rio, Rooney, evra,carrick,rvp,fletcher,giggs, Scholes and had to replace our core. For us replacing a 26 year old rio was as difficult to replace a 36 year old.rio. But because we got pennies for selling rio, we had to spent big chunk to get a defender. What's also funny is that from 2009-13 we used the Ronaldo money which meant our investment was poor and hence we had to revamp our squad which even till now is not completely revamped as players are more expensive. I dont think any other club lost their main core like us in the past 5 to 6 years.
The reason I hate net spend argument is because manager still got to spend a big amount of money and he is not judged on that. Like last season say what conte spent more than £200m yet Chelsea fans were saying board did not back him and included net spend for some sale.of some random players. It's like me selling my junk furniture and then spending money to buy a new one and if the new one is not good enough I make a excuse that I spent only this much because I had to sell some.
The bottom line is manager be it klopp or Jose or sir alex should be judged on the money they spent. And the fact remains klopp has spent big money. No reason to be ashamed of that or denying that.