If you can afford to, spend it. If you can’t, don’t. Just like real life really.
Given that City had over £700m income we should be able to spend more than anyone. Clubs like Accrington Stanley and Barrow probably hardly anything. Unless they were bought by a multi-billionaire, in which case if that owner wanted to, why shouldn’t he or she be allowed to offer £300m to sign Mbappe or Salah for Barrow and pay their wages?
Say Jeff Bezos or the Sultan of Brunei bought a League 2 club, why should the football authorities imply he can’t afford to sign £1bn of players in one transfer window? Other clubs should just suck it up and accept it wasn’t them who won the lottery. Which brings us back to why ffp started - rags, scousers, arsenal and to some extent Barca and Milan wanted to take their ball home when City got Sheikh Mansour. That’s all it is. The whole reason for it and why we should always fight it and spend what the fuck we want.