Valid points, however most entertainment organs and arrangers are played primarily by Home Hobby players (As are most You Tube videos) who wouldn't know how to use the SWAM voices.
Playing technique is always lapped up by home hobby players, hence they are featured heavily with dealers and festival demos in Europe and Asia. (The US is the odd one out, as there are only a few dealers in a hell of a big country)
The upside with the Wersi, is that the voices you mention can be played with the Wersi as if they were part of it (One combined unit rather than having multiple items which don't fit well in a home environment) as it has an integrated VST Host.
The manuals can be downloaded here if you want to see its current capabilities (As per usual with Wersi it will be further updated down the line, including from feedback from owners) so you never know where things are going to go.
NOTE: Choose OAX Operating Instructions for the English versions)

Bill