Any worry with 3rd party modem?

I know they offer a lot of options like band locking, but they also offer things like Carrier Aggregation, Standalone, etc.

Any worry that it'll make it easy for TMO to catch on? Like let's say you're sitting on N25 all day (which the current modems don't offer iirc). Or aggregating since current models don't support that.

Any thoughts?

Edit: I mean using a 3rd party modem in place of a TMHI modem, using the same TMHI SIM, if that changes anything