The same as Core Optimus Prime, Starscream, Megatron and all: Offer a major (and typically expensive) character in a low cost format. With Deluxe figures hitting $22-25, I think the core class makes a compelling option for smaller retailers who might not want to stock pricier price points. Especially with the introduction of major named characters in the mix.Don't get the point of Core Shockwave, but hopefully they keep the size class around for Bayverse stuff. Lots of odd little bots that'd be perfect there.
The press release says Ravage does indeed fit inside Soundwave.Ravage is the only one of these who transformed in the movie itself, and all he did there was eject out of Soundwave's chest.
And yet I'm not 100% sure if this Ravage can go inside this Soundwave. (And even if he can, that still doesn't explain what Soundwave is.)