One of the tricky parts about the shift to Signal or e2e in general for politicians is the data retention FOIA problem. It's not really an issue for parties but

One of the tricky parts about the shift to Signal or e2e in general for politicians is the data retention FOIA problem. It's not really an issue for parties but is when government business slips into the inevitable conversation at some point. With some of the people we work with they've found themselves having to screenshot and send hundreds of messages. It's one of the reasons why I think Matrix is going to become more popular for low level government conversations. As it is recently in France. As far as I understand they have managed to solve this problem when deployed in such environments.