I also feel like agile methodology, which is becoming more common, works against documentation with the fail fast fail often philosophy. If your feedback loop with your stakeholder is rapid, then changes to the design plan are often and rapid as well, which requires more documentation change overhead, which makes documentation even less appealing.
In fact SAFe Agile emphasizes working software over comprehensive documentation.
for me there isnt much wrong with discord, i just prefer foss and self-hosted where i can.