Complaint about bad support

I am using the Xfinity modem. As I said, by default multiple routers in nearby apartments are all using the same channels. The page you quote is not useful. It states "means that these settings are being managed automatically to help optimize" but they are not being optimized. Optimization would, as is standard, look for the least congested parts of the spectrum. The Xfinity router is just using some arbitrary default. For instance read https://www.intel.com/content/www/us/en/support/articles/000058989/wireless/intel-killer-wi-fi-products.html. This is not new, the approach has been around for many years and is common knowledge.

Please read the literature such as the page I mentioned. You are making incorrect statements about 5G/2.4G versus channel and this will mislead.

5G/2.4G are frequencies

157 (for instance) is the central 5G channel for the band ~143-163

The gateway is not automatically picking the best channel. In my case the default channel Xfinity is using is shared with the networks anissabrad, pretty fly for a wifi as well as two Xfinity mobile, one hidden and another Xfinity wifi. By comparison channels above 164 are open.

If you are arguing that your gateway is doing something that is an improvement over established literature, then please provide the details of measurements and what your device is doing that prove this. You cannot just state that E=mc and not Emc**2 without proof.

@user_ypu295 I'd like to check and see if there is anything I can do on our end. The gateway should be optimizing to the best channel and network, if it isn't we can see what troubleshooting options we have. Please send us a DM to Xfinity Support with your full name and address to get started.

To send a direct message:
Click "Sign In" if necessary
Click the "Direct Message" icon or  https://forums.xfinity.com/direct-messaging
Click the "New message" (pen and paper) icon
The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there.
As you are typing a drop-down list appears. Select "Xfinity Support" from that list.
An "Xfinity Support" graphic replaces the "To:" line.
Type your message in the text area near the bottom of the window 
Press Enter to send it

A final comment. It turned out that I had an extender, so I used that. During the setup, the extender diagnostics said "you have conflicts with this channel, we suggest that you change". I am not the only person pointing out this deficiency, I cannot understand your defense of this as it is contrary to everything known about WiFi for decades.

Please read the prior messages. Throughout this discussion I have been referring to the bad choice of the 157 channel for 5G. This is not the same as whether to use 2.4G or 5G band. What you sent is  irrelevant. The link you should have sent is https://services.hummingbirdnetworks.com/blog/choose-the-best-wifi-channel-for-your-network#:~:text=A%20Wi%2DFi%20channel%20is,in%20the%206%20GHz%20band. or a similar version, which discusses channels.

@user_ypu295​ their agents just read a script. They have no real world knowledge of networking.  I mean they swear my service went down at 9:54 pm last night, they also admit that I was using my service until 6am this morning but still tell me my outage was caused by a invisible storm that never happened today. Storm was last night, they intentionally bought the network down,  don't lie and say it's under investigation. 

Your automated program is nagging me to accept one of your agent's responses as the "Accepted Answer". No, as they are either incorrect or unhelpful.