That's besides the fact that there are genuine certified unleaded alternative fuels for piston aircraft now. Fucking "we oh can't do it" lead apologists smh.
And I mentioned workhorse aircraft for a reason, considering that the Velis Electro has a payload of...172 kilograms. Turboprops (gas turbines in general) are far more expensive and far less fuel efficient at low altitudes than their piston engine counterparts, which is precisely why piston engines still exist.
The fact that alternative fuels now exist for piston engines does not make the blatantly wrong nonsense you've been throwing out any more correct, such as your suggestion that you can "just run" piston engines on Jet-A. That is something that anyone who actually knows anything about internal combustion engines can tell you for free causes regular piston engines to detonate/knock. Your assertion that piston-engine aircraft have virtually no vital role was similarly ignorant.
And that's besides the fact that black-and-white "if you don't agree with whatever half-assed or plainly incorrect crap I say in support of The Cause™ you're an apologist" nonsense lost its efficacy years ago; you might want to find a better soapboxing tactic for 2026.
You're also legally required to maintain 30-45 minutes of emergency reserve, longer if you're flying IFR.
And again, this isn't even touching on the "long" cross-country flights that are legally required for training.
You can't just run piston engines on jet-a but you can run them on regular high octane from any regular gas station or any of the actual alternatives, my point was you can swap them for small turboprop powerplants and run the plane on jet-a. Afaik reducing knocking is not really the point of avgas either, which I'm sure you know, but vapor lock at high altitudes, which you can easily avoid by... not flying high, which by your own point is the main use case for piston aircraft. I guess we'll just spray lead over everyone instead, cause it's "safer".