When is the last time you used it? Because I have none of these issues. None. Especially since "It doesn't sync with your mobile client unless you open the app

When is the last time you used it? Because I have none of these issues. None. Especially since "It doesn't sync with your mobile client unless you open the app on your phone" is architecturally completely wrong. The desktop client doesn't communicate through your phone. That's how WhatsApp web works, but Signal Desktop doesn't.