@felixfontein the intention is explained in Proposal: Consolidating Ansible discussion platforms - #21 by Andersson007 and we’ve already updated the communication guide just leaving there general Matrix channels.
There have never supposed to be a ban on individual projects (including collections) maintained by the community to use whatever they want for communication. And there’s no ban on Matrix/whatever in the collection requirements AFAIK and even is not planned to be proposed 
, just a recommendation to use Forum + less than more other platforms to reduce fragmentation.
No actions required on stop using anything community collections/projects want.
@gundalow should the proposal description of this topic be updated correspondingly? or maybe i need some corrections in expressing the intentions?