Budget cuts, "peace dividends". In his heydays De Gaulle insisted the defense budget shall be 3% of the GNP. This gradually shrunk to 2%, post Cold War. Yet before the 2015-2016 terror attacks that killed 273 people, President Hollande 2013 defense review would have shrunk the defense budget to merely 1%.
Since then it has been gradually augmented, presently hanging around 2% or a bit more. From memory, objective is 2.5%.
France independently produce world-class military systems but afterwards, procurement is only in peanut numbers. Think of the CAESAR guns when Ukraine asked more. Same for Rafale, for frigates... France military budgets are very tight.
30 years ago at the end of the Cold War, the AdA insisted on a non-negociable number of combat jets : 450. Since then the fleet, Aéronavale included, has been cut to 225 : Rafale final objective. Except that objective has recently been pushed to 2035.