because the need for them has spiked resulting in an unprecendented level of R&D going into them in recent years? And R&D into tons of different approaches is a

because the need for them has spiked resulting in an unprecendented level of R&D going into them in recent years? And R&D into tons of different approaches is a good thing, actually? And because it's frankly a young field of research? This is a publication from academia - of course they're trying new things! That's the entire point! That's their job! The incessant press releases suck but PR people gonna PR.