I care. I have a legitimate use for USB 3 on my phone.

My home ISP is unreliable. It doesn't care if I'm in a time sensitive meeting. When it does go away, I need to quickly get back into my meeting.

Sometimes it goes away for hours. It has also gone away for days sometimes. I need an alternate internet connection, and preferably one that doesn't require my neighbourhood to have electricity, because that also is unreliable where I live.

So I use my phone. For short durations of use, I use the Wi-Fi Hotspot feature, but for longer durations I switch to USB Tethering.

At USB 2 speeds, I'd guess, the Ethernet connection can only negotiate a 100 Mbps link speed. That is much slower than my home ISP.

The phone I use currently has USB 3 and cost me half the price of an iPhone 15.