In the times of the Gaonim there was a problem with women who weren’t receiving gittin and therefore went off the derech, got divorced in secular courts and married non-Jews. So the Gaonim made a takanah to force a get even in situations where the Gemara did not allow it so that it would be easier for women to get divorced.
Now, unfortunately, today there is no central place of halachic authority like there was in those times. But the RCA is to its members like the Gaonim were to Klal Yisroel at the time. No one is forced to be a member of the RCA. If you don’t like their takanah, then leave.