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the main downside of network-manager is it tries to manage everything by default and I think you need to do some stupid fiddling with udev and its configuration to make it not do that, but that's not a fundamental design flaw
ModemManager can die in a fire because it fucks with all serial ports by default. And nobody uses modems these days anyway, we just tether to our phone. NetworkManager is fine though, on laptops and maybe some desktops.
*you* don't use modems. I absolutely use an LTE modem and I would have never been able to set it up without ModemManager. also, MM does exactly what is permitted by the USB spec: uses CDC ACM devices for their stated primary purposes. it's you who abused CDC ACM for USB-serial
MM used to do it for FTDI devices too, but distros (or at least Ubuntu) eventually disabled it (presumably after too many "maker"-type people complained).
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