Using the default config, RouterOS adds a dynamic 0.0.0.0/0 route, when I connect an USB LTE device. However, it does not add the new LTE Interface to the WAN Interface List. This is necessary for clients to use the route (i.e. LTE) for internet access, as the default masquerade firewall nat rule matches on the WAN List.
From my perspective, RouterOS should add the LTE Interface to the WAN List by default, and make it an option in LTE APN like "Use Peer DNS", and "Add Default Route". What do you think?