Success of MCU-verse movies has given a hope to some DC fans, they want to see all DC characters in a unified shared DC universe, to them, anything outside of that means it is not worth the time. But there are some DC fans who hate the current DCEU and want it to end, and they want independent stand-alone DC movies unconnected to each other.
DC is try to do both, by launching "Else-worlds stories" and continuing DCEU. We will see how successful both are in near future. Nobody should be forced to follow the herd, if you dislike DCEU, then don't watch it just because others tell you to, similarly... if stand-alone movies don't interest you, then skip them, no need to watch those movies just because other fans are watching them.