TBH I don't think anyone really notices the slowness. It's the reliability that's the issue. Being kicked off your connection multiple times a day/week is not acceptable to most people. But when you have 4 phones and only the Intel modem phones have issues, that's how you know. And yes, we've done testing on this internally where I work.In the US, why do you think few Europeans complain about connectivity, it's the providers, too little coverage.
Read the graphs, prove is there, they are just a tiny bit slower.
It sucks, but like I said, Apple might be able to fix the Intel dumpster-fire and set it straight.