You can't spend more on everything, not on a percent of GDP basis. This is a stupid idea since every GDP is limited to 100%. If you spend more you have to take debt and spend future GDP
https://randomcriticalanalysis.com/2019/12/03/no-means-no-th...
Also while I agree that 100% of a GDP is a reasonable approximation of an upper limit in practice, that's not necessarily strictly true either. GDP measures domestic production, not the income available to residents. The income available to residents can certainly be much less than GDP (e.g., Ireland, Luxembourg, etc), so the reverse can be true in principle too.