Didn’t they lose already a couple airplanes due to Gerans?
Both F-16s and Mirages, right?
Yeah, also MiG-29s. Mirage was mechanical failure IIRC and I don't see a reason to doubt that one based on what's publicly known (after all they admitted it was due to drones in other instances).
I personally think the F-16 was still not a good pick for Ukraine, logstics this and that, yadadada. Ukraine doesn't have the infrastructure and expertise to operate an aircraft that was very much designed to operate most efficiently in the wider NATO and NATO-adjacent framework. Something like a Gripen C or F/A-18C/D would have suited their circumstances far more, after all available MiG-29s were already handed to them.
Imo the best bed would have been to give them F-16s after the war is over, fund and help them overhaul their infrastructure and then you can from the ground up integrate their operations and training into the wider western framework without pressure and the lost jets, lives and money. Because let's be honest, these F-16s aren't doing anything important right now either way. And that was to be expected with the circumstances at hand (rushed training, inexperienced ground crews, terrible environment to operate it, constant threat of drone, missile and air attacks). So I think we can't even be mad at them for not performing, because they never had a chance to utilize these jets in a meaningful way.
While handing them ANG or former USAF F-16 Block 50/52s after the war to familiarize them with NATO equipment, NATO standards, procedures, maintenance, infrastructure and systems would have been a more effective use of the available people, some of which have no sadly passed away with little impact. These people could have undergone the usual length, in-depth training, remained in the US, fly there training and exercises and could have trained a next generation of post-war pilots. It is in every way imaginable unfortunate.