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Please add m.2 lte and 5g modules with sim slot. They make good for IOT projects. I have seen people doing projects. Two vendors are quectel and Sierra wireless based off Qualcomm radios.

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It looks like the MCUZone CM4 4G mentioned here [1] is intended for just that purpose! I would be happy to try out a chipset provided it's not too expensive, and (ideally) it has good Linux driver support.

Drivers seem to be the dealbreaker for a few cards, if they rely on PCI express features the Pi OS or SoC currently don't support (like BIOS, or sort-of MSI-X support).

[1] https://github.com/geerlingguy/raspberry-pi-pcie-devices/iss...

Those need m.2 B key slots which are not compatible with m.2 M key NVMe disks. This is why I'm not crazy about the m.2 "standard".

To be fair the same thing can be said about its predecessor the miniPCIe slot.

True but that was only really for the msata version. m.2 has about half a dozen keys as of now. Like USB-C it tries to cram too many mutually incompatible electrical interfaces into one plug.

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