I always book my flights to include the two sidecar races, There's no chance I can watch the 1st then have 5 days inbetween waiting for the next one. (With that I mean I wouldnt be allowed.)

I possibly does raise the profile, but I don' think the change was ever to intentionally do that, it was just a bonus.

apart from the bonus of running the same day as the senior this change doesn't help the sidecars in any other way.