xfinity app doesn't work on my phone, so I can't use the "faster speed" modem. What now?

I've been with xfinity internet for about eight years.  I've always accessed xfinity internet with my iMac desktop, and I've always been wired (not wireless), and was always able to make updates and changes through said wired internet with said iMac.  Then one day, xfinity sends me a notice to update my modem so I can "start enjoying my new speeds as soon as possible."  I receive the new modem (containing ethernet ports for wired, mind you), with new instructions to "get online fast with easy, guided activation."  Unfortunately, they tell me I specifically NEED to download the xfinity app to my phone and scan the QR code or type the text code into my app.  My basic flip phone doesn't have Android or whatever I'm missing, so it isn't compatible with the xfinity app, so downloading it doesn't work, and there's apparently no longer the option to use my always used wired iMac to set up modems anymore.  Disappointed, I send the "faster" modem back and am still using the old current modem.  I checked everywhere on the xfinity site but it keeps telling me I NEED the phone app. 

This isn't rocket science.  Technology should be about moving forward with efficiency and convenience, not backward.  "fast with easy activation" doesn't mean having to jump through flaming hoops on moving conveyor belts just to flip on a switch.  This is 2024.

When do you plan on releasing a "fast and easy" modem that doesn't alienate wired iMac users like myself?