does xfinity still support personal computers?

• every new page requires re-login
• many links yield 400 error -- Request Header Or Cookie Too Large
• other links direct one to download one of the mobile apps
• instructions don't match reality
  • trying to find my equipment list says to log into account and it takes you to a DEVICES page
  • no it doesn't

this is astonishingly bad.  it's almost as if it's intentional