electrum developers have to force users to upgrade new versions if old versions have problems. Just check its version from startup
No. There can be many compatibility issues when updating a software to a new version. Many big updates from Electrum - like when they went to python 3 - stopped working for many users who were in older versions of Windows or in specific linux distoros. Also, this may become an extra attack surface.
A warning is more than enough.
Hi, I work for Electrum Technologies GmbH. We are aware of the attack, and to mitigate it, we have done a number of things:
As I said in the other thread you also replied, prove your identity when using an unknown account. In this case, as an Electrum dev.