Fully agree. Those doing Groups need to be continuously reminded about this compatibility. Tendency to "wheel reinvention" is high and co-creation is also not front and center in thinking with implementers, unfortunately. There's a Groups FEP created by Lemmy dev. I nudged Flarum, nodeBB and Discourse folks to come together. On SocialHub @trwnh gave some great insights. I hope more FEP's will be proposed, so that interop guarantees can be higher.