For example, Skype hit that very early on - you were able to make and receive voip calls of a very good quality, zeroconf, for free. It really didn’t need anything else. It just did one thing really well. That’s not stagnation.
I don't know if this was because Skype was developed before the “mobile wave", but to this day it's still not a great app to make calls from through mobile.
Whenever I'm calling over 3G/4G it often disconnects, and I'm not the only person who seems to have this issue.
WhatsApp seems to be a lot better for mobile calling
For example, Skype hit that very early on - you were able to make and receive voip calls of a very good quality, zeroconf, for free. It really didn’t need anything else. It just did one thing really well. That’s not stagnation.