ModemManager use on Linux systems

It seems that tutorials do not advise to use ModemManager (mmcli) on linux systems used in conjonction with NetworkManager (nmcli) while they are powerful and easy tools.

My question is probably naive, but why? Is it not sufficiently reliable?

Thank you

Oddly enough, using NM with MM is the only way I managed to establish connection with my LM960…

See: Telit LM960A18 on Raspberry Pi 3G/4G & LTE Base HAT - #14 by j051y