Do any other ebike vendors has something comparable with Nyon 21 in terms if functionality? Or at least something with built-in GPS navigation outside smartphone app?
Yes, Bosch has lots of areas to improve in their software and displays, but they are still leaders in this area and none of the competitors are even close to them in aspect of display functionality. You can be 100 times Specialized fan and Bosch hater, but facts are speaking for themselves.
Just try Specialized. These famous Bosch displays: Are you talking about Purion, Intuvia, Kiox, Smartphone Hub, or Nyon? Old or new Nyon?
Bosch are light years behind Specialized. Specialized understood connectivity was the key; Bosch are trying to push everything into the display, and they even cannot do it right. Any Garmin Edge connected to a Specialized e-bike is better than the new Nyon.