Few thoughts:
-Trade ('YEAH CRAZY BARGAIN') and extension ("OMG OVERPAY") have to be considered as a package, it's obvious that Rich Paul and Fox applied max leverage to tank his trading value in exchange for a 4 year max extension commitment, we just got to know the second half of the deal
-Nobody ever questioned that Fox was worth his current contract which is a 25% cap max deal, so at the very worst this is an overpay by around 8/9M$ a year, FO estimated that they could live with that in exchange for getting Fox for minimal assets
-"but now we have Harper': if we were good with Fox before the lottery we are even better now with Harper on top, this is a rich man problem to have and as much as I believe in Dylan thats not reasonable at all to expect him to be as good within 2/3 years as Fox, a consensus top 30 player and top 8 lead guard when he was fully healthy in 22-24
-Obviously, if Harper develops as we hope we'll need to make room for him on the court and on the spreadsheet by 2029 at the latest, at this time Fox will have just 1 year left so barring crazy injuries or dramatic level drop his contract will be movable, there will always be a mid team lacking talent at that position willing to pay a 30/31yo Fox.
-In the meantime we will be able to compete way better than with just starting DH, the young guys will have the opportunity to gain some PO experience earlier, we keep Victor happy, and if everything clicks we might contend as soon as 27. All of that with keeping our future assets quasi untouched (2 real first picks)
All in all, a solid move short and long term wise in my opinion. Would I have preferred a flat 200/4 effectively decreasing from 30 to 25% cap over its course ? Yeah sure that would have been ideal but we dont always get exactly what we want, and this is a reasonable compromise.