The huge red flag to me is that Signal is no longer decried as the devil of western intelligence anymore.
Frank Figliuzzi (former FBI cointel) and Chuck Rosenberg (former DEA admin) used to rail on about all of the dangers posed by Signal, but I haven’t heard an unkind word in over a couple years now.
We each make a choice according to our level of comfort in concern to privacy, or lack thereof, in how we choose to conduct ourselves afforded by the solutions we utilize and the rituals we observe.
Remember, privacy can never be enforced or guaranteed, only encouraged. Best practices, as available, as it were.