Yes, in Fukushima it would have been much better, even if there was fuel rod fire, due to... better plant design...
Fukushima costs are blown out because Japanes govt wanted it this way. Just like JP govt forced long term evacuation even if the doses both during and after event were not life threatening.
"Seriously, why are we doing things like this when we have cheaper, faster and safer options? Why are we not instead going for the options?" - like what? Renewables firmed by gas and coal like in Germany? You are aware it spent on it's transition so far much more than France spent on nuclear while achieving worse results, while killing thousands from coal pollution in the meantime? So Germany spent more, achieved much less in much longer time. And on top it plans further gas expansion to firm renewables. This is not a cheaper/faster/safer way. It's the exact opposite in all directions.
"It will require so much batteries" Yes. So let's get started, we can build as many batteries as we need 10 times over. "Synth fuels are inefficient", yes, but that doesn't matter when the electricity is close to free." - electricity for synth will not be free and bess will eat into it's economics. Synth fuel infra isn't cheap either. Using H2 for firming is a pipedream pushed by fossil industry to justify expanding gas infrastructure.
It has to be nuclear + renewables. That's the difference - we already know it works good looking at Sweden and France. Others that tried to follow pipedreams ended up worse