Disagree completely and this is one of the biggest gripes I have who still rate Jose.
Spending huge amounts is fine, and I believe you need to spend big amounts to win big things. However, it needs to be sustainable in terms of the players you're buying - their age profile, potential resale value and so on.
Even at Utd, Mou bought in Matic to a side that already had Valencia, Young, Mata, Herrera, Smalling, Zlatan, Mkhi, etc.
All these guys had 2-3 seasons left at best left in them. What he needs to be buying is a long term replacement so that the next 2-3 years are spent replacing these older players instead of replacing both these players as well as the new signings.
Next season it was Perisic, Boateng.,etc. You cant afford to spend a huge amount on them as there is no way you'll be given a 200m warchest every single time.
Now compare that to Pep's signings. Sane, Gundogan, Cancelo, etc. Even the flops he managed to sign, most of them returned back a significant percent of the transfer fee thanks to age being on their side