Re: Lan replacement
In an office environment, perhaps cell tech isn't what's called for. WiFi-based tech is and will remain the preferred setup for closed environments (like an office floor). You can set up masts, boosters, and so on, link it to your landline, set up enterprise-grade encryption, certificates, and so on, and with some investment in time and capital come up with something within reason that can perhaps give you a return on not having to run cables and conduits from the drop ceiling.
While 5G may WANT to do everything, to borrow an idiom, not everything is best done with a hammer.