Except… It sort of is? GPS was first launched in 1978 (oh look, the year the F-16 was introduced). The F-16 is an ancient platform and Ukraine has already shown that CAS is rather challenging given how advanced modern munitions are. At the start of the war they were literally plucking planes out of the sky.
Plus, NATO doctrine relies on complete battlefield superiority and complex logistics… Things that Ukraine lacks. How exactly is Ukraine supposed to turn the tides with F-16s when the Russians have stealth planes and hundreds of Su-35/34/30s?