Signal is finally tightening its desktop client's security by changing how it stores plain text encryption keys for the data store after downplaying the issue since 2018.
"The database key was never intended to be a secret. At-rest encryption is not something that Signal Desktop is currently trying to provide or has ever claimed to provide," responded the Signal employee.
Tl:dr Signal is 'insecure' in the same way your mail is 'insecure' after you've opened it and it's sitting on your counter. What, you don't keep you mailed locked up inside you own house just in case someone breaks in?
I actually manually hash every letter I receive using a rotating cypher kept in a secure vault. Always rough when the letters include images... Had to invest in a storage unit for the pixel-by-pixel encryption of last year's Christmas cards.
The comment about waiting until there's twitter drama to fix something is spot on. It took them a few days to fix this and it could've saved them the bad publicity for such an obvious fix.
Others have been asking for a password prompt for years too. Using the local keychain is good, though a user-defined password is a good option too. However, many people have terrible opsec and would probably opt for horribly weak passwords.