After careful consideration I came to the conclusion that it makes no sense to keep the session export/import feature, once the key backup export/import feature is in place.

After a long transition period no one came up with a use case which a session export/import covers that is not covered by just logging in on a new device and import the key backup.

If you have know a valid use case, please comment on this.

Otherwise the key backup export/import will superset it in the next version