@strypey @reiver
My understanding of OP's post is that people may use these tools for reasons other than forming personal communities with like-minded privacy enthusiasts. Each user's communication needs come with a different threat model and only some cases would benefit from E2EE.
For example, folks in corporate environments can benefit from E2EE while discussing commercially sensitive topics or customer information, but point-to-point encryption is usually enough because corporates will sue the chat software company if a data breach occurs. Data loss won't be part of the company's threat model unless it risks a material impact to profit.
Open source maintainers generally hold discussions in public or with a wide audience, so loss of confidentially isn't a concern. Therefore, E2EE is unnecessary most of the time for open source projects.
A patient having a telehealth consultation with their doctor strongly benefits from E2EE because any confidential discussions leaking could result in harm or discrimination.
A chat with family or friends could benefit from E2EE to avoid messages being harvested for targeted advertising. However, only some people consider ads a threat and therefore only some people will recognise a benefit from E2EE.