In all of these cases, the back pressure that gives wide review any force, beyond a moral high ground, is the fact of multiple implementations. To put it another way, why would implementers listen to wide review if not for the implied threat that a particular feature will not be implemented by other engines?
So yes, I absolutely think multiple implementations are a good thing for the web. Without multiple implementations, I absolutely think that none of this positive stuff would have happened. I think we’d have a much more boring and less diverse and vibrant web platform. Proponents of a “move fast and break things” approach to the web tend to defend their approach as defending the web from the dominance of native applications. I absolutely think that situation would be worse right now if it weren’t for the pressure for wide review that multiple implementations has put on the web.
Microsoft’s release of its new, Chromium-based, Edge browser has sparked renewed concerns about the rapidly decreasing diversity of browser engines. “All browsers becoming Chrome” is problematic in many ways, but while having bigger contributors like Microsoft in the Chromium project could actually help steering the project away from its Google-centric agenda, the issues intrinsic to relying on a single implementation remain open.via torgo.com