The problem with fixed limits like that is that it will prevent any challenge to the existing order. No updating for inflation will make it harder and harder for any team to break into the elite group.
For many years, United, Liverpool, Arsenal, and Chelsea locked out the top four. That gave them access to European money and they were barely challenged without any spending restrictions in place. Over a long period they locked out the top four apart from when Everton edged Liverpool out. The rules were changed to put Liverpool back the in CL and Everton fell in the payoff round.
It was only when challenges from Spurs, City, (and later Newcastle) came in to that four that the established G14 clubs came up with FFP. It is now being used by the US owned clubs to ensure they can make money and stifle competition. Newcastle are being hidebound by FFP. Villa will probably be prevented from mounting a serious fight.
Such limits will prevent much challenge to the biggest clubs and destroy any real competition. I am sure that once these charges are dismissed, City will be happy with FFP.
That doesn’t make it right.