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They are regular containers when up, but when folded they are just big flat heavy pieces of freight - so you can load them as any other 40' long piece of freight but that means extra handling gear, forklifts, cranes etc at the customer's site to collapse them.

You can put them on flat rack, but those are a pain to handle as well. Now if eg. 10 of these folded flat could lock together and be the same height as a regular container and and be handled as a regular container that would be great.

Frankly when you can pay < $1000 for a new steel container in China nobody is going to be buying expensive, unproven composite containers however clever.