Downsides of the open-source modem firmware?

[alpineduck]

Hello,

I recently got myself a PinePhone and intend to use it as my everyday phone.

I learnt there is an alternative, open-source firmware available for the Quectel modem.
Are there any downsides of using it instead of the original firmware?

I read a lot about its benefits (improved security, lower operating temperature, etc.) but nothing about possible issues with it.
Is there something which is known to work better with the original firmware or am I basically loosing nothing by ditching it?

Thank you!