Hmm, I don't think so because I know someone who hs his Amiga hooked up to a 1942. Maybe you mean the 1702, 1802 or 1901, which indeed are crhoma/luma & composite only ?
But I also forgot to mention 2 monitors similar to the 1084:
the 1080 and the 1985.
The 1080 is the same as a 1084 afaik, but in a A-1000 like case.
The 1985 on the other hand is a Amiga-only monitor ( RGB only, no composite or chroma/luma input ) and has a higher dot-pitch which means the picture isn't as sharp as on a 1084.