The topic is about COMMERCIAL exploitation of electric airliners not research comparable to journeys to Mars, it’s going to be decades before we see airliners powered by COMMERCIAL renewable fuel.
I think you might not know what an analogy is.
The point is someone has to start offering the technology, like these companies are, governments get interested, and we see development in the area. If you just sit and wait for the technology to be perfect, you are already too late. In the past a lot of engineering has been done with anticipated technology in mind, it just puts your company ahead of the curve.
All independent electric vehicles share the same issue, battery capacity vs weight and space. Whether its a commercial airliner, car, train, bus or ship. The Commercial airliner is just waiting on the right batteries to enable it, at current rate of progress one will be flying in possibly 10-20 years, hence why designs are already being highlighted. You throw out a basic design, other unrelated parties start thinking about the engines and batteries for it, you get together and make money (or lose lots of it). 10 years ago some would've scoffed at cars like Tesla existing on Australian roads in the same manner.