Note that 0f541be6f1 added a warning log if asserts are disabled.
It is intentional that these two things are in separate files:
We always want to log that warning, even if someone is using electrum as a library.
However, in that latter case, I think it's fine not to sys.exit(), but leave the decision up to the library user.
Similar thinking when running from source: let's log the warning but don't sys.exit().
0e5464ca13