Oh Joris, sorry, I'm not expecting a different behaviour or result.
Is just my kind of work use that process all the time. So I was using solid, flip, sometimes an inverted crop, even the reveal fx. I can do all the job with the bundled filters. But allways have the suspect that I'm doing something wrong because the use of filters that are not especifically designed for that (you know, I come from the node based school, stacking simple tasks).
I use to ask myself: is there an overprocess if I use that filter for an solid composite? Is certain filter adding weight to the pipeline if I use it for an alpha switch? etc..
Maybe I'm getting the best I can get, but the lack of an specific filter makes me doubt.