It was exceedingly telling when Google bought moto (at the time a good phone manufacturer and excellent radio within) and gutted and dumped it instead of keeping it on to go wild with the nexus/pixel side of the house.
Motorola phones where using Qualcomm modems. There is nothing really special about it. Even the Nexus had the same modems during that time period. Pixel phones didn't have widespread modem issues until they switched to Samsung modems starting with Pixel 6. Not sure what is there to tell about it other than Qualcomm makes good modem. Even the iPhones with Intel modems where inferior to Qualcomm modems and thank god they switched back to Qualcomm with iPhone 12.
Intel's cable modems also had issues. I wonder if there's some patent they're trying to work around that technically has alternate solutions, but they're all inferior on power consumption?