I hadn't noticed that. If I ever run out of channels all to myself I'll definitely look into it!
However, I have my router set to Auto, even though it hasn't changed channels since I manually set them. It seems 99% of Americans either use the cable company's router or their own cheap version and never change the settings. We've been in our home for a year and after I bought my own router and separate WiFi I have always had channel 9 for 2.4G and 153 for 5G all to ourselves. As a matter of fact just looking now, there are 9 other wifi in range and every one of them are the old Brighthouse which has been bought by Spectrum or the rebranded routers called SpectrumWiFi. So, ignorance of others is more wifi for me.
What I truly hate is Spectrum (Cable/internet provider) is the only vendor that will service my address. And, since the rest of the family needs TV of some sort I decided on PlaystationVue. It gives us the 5 connections at once we need, Cloud recording for each profile. Dang racket (I wish I got in on 20 years ago or so).