well, there is wireless wan (WG) now, but it supports only one single SIM. instead A LOT (the stuff in the red box) is required: during the festival, the LTE performance goes down, as all visitors are registered to the same cell basically. many of those SIMs, properly setup - brings the throughput to a decent level. but at least MX with integrated cellular should definitely support USB-LTE (via USB-HUB not just one single stick) and integrated cellular at the same time. also, there are frustrating differences between the handling of WAN1/WAN2 on the MX compared to (integrated) cellular (ie stupid warning in case WAN1/2 are not used/connected). there is countries and situations in which cellular is cheaper, more reliable and/or simply more available then ethernet based internet. and yes, i know that you can now get a WG to "convert" LTE to ethernet by now, but WAN1 with MG, WAN2 with MG, integrated cellular and USB-LTE would not be enough in this rough situation 😉
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