Indeed, I understand why Soundwave and Blaster are the size they are. I also used their FoC Voyager versions as their "Classics" selves for quite a long time, but they just don't fit very well aesthetically compared to their '84/'85 compatriots, who are all (mostly) real world based vehicles and objects. The much more Cybertronian alt modes for the FoC bunch mesh a little better with some of the more whimsical/futuristic designs from '86 and onwards, but those aren't really their intended "peers" as far as I'm concerned. I'd love for Hasbro/Takara to just do solid voyager Classics versions of not only Soundwave and Blaster, but Ironhide, Ratchet, Trailbreaker, and Hoist...and all the Seekers...and Shockwave. Is that so much to ask, lol?
I think an update of Soundwave as a surveillance van and Blaster as an SVU/sound system on wheels would be fun and fitting for each character's personality.