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I can't find the source. But one reason was that if you take the specification and implement it from scratch you end up with a significantly worse performing s

I can't find the source. But one reason was that if you take the specification and implement it from scratch you end up with a significantly worse performing solution than simply buying it from Qualcomm. It could also explain why Apple is putting this first in their iPhone SE4 as their users will already expect not to own the fastest phone.

fsflyer 4y ago
It's worse than that. Often the specification isn't complete. You need to pass the conformance and interoperability tests. The chipset needs to support older standards as well and pass those tests. I suspect they'll find a number of "quirks" in various equipment, that will need to be worked around and then retested. It's a long process.