SimpleX is only attended by the core admin who is not always online and doesn't have it installed on a mobile device (which might change later).
I think you should add this information for SimpleX on eXch website.
From my experience I tried contacting eXch support with SimpleX chat using link that was provided, and nobody accepted my request or answered anything to me.
I think that the support page[1] would greatly benefit from a condensed information presented here so that the users could know what they could expect in terms of reply by using the available support options:
For fast and secure assistance please use our ticketing system as it's monitored and attended by all of our team members. Your communications will be encrypted by our own TLS certificate on our HTTP server without any intermediary third-party servers (such as Cloudflare), since all the frontend servers belong fully to us and operate strictly on bare metal hardware that will be automatically considered compromised by a state-level attacker in case there is a single unexpected reboot to happen.
Email without PGP is also a fast option which is also attended by various people but less secure.
Email with PGP is a slower option, since the PGP key is only possessed by the core admin/founder.
SimpleX is only attended by the core admin who is not always online and doesn't have it installed on a mobile device (which might change later).
With this information displayed it would be up to the user of the service to decide and to balance out their current needs (do I need immediate help that I feel comfortable using a ticketing system for? Can I wait a bit longer and use email with PGP?) in order to choose the available options. At the end of the day this would just be another layer of transparency, which is always great from my perspective.
[1]
https://exch.cx/support