Do not kill Presto, one of few excellent browser-engines and the most unique one! Open sources of Presto engine!
A monoculture is usually better in the short term. It’s a better allocation of resources (everyone working on the same thing!) If you want to write a rich web app that works today (ie, on the browsers of today), it’s much better.
But the web is a platform. Platforms are different beasts.
Imagine it’s an all-WebKit mobile web. Just follow the incentives to figure out what will happen.
Preventing innovation: a gang of hackers makes a new browser that utilizes the 100 cores in 2018-era laptops perfectly evenly, unlike existing browsers that mostly burn one CPU per tab. It’s a ground-up rewrite, and they do heroic work to support 99% of the websites out there. Make that 98%; webkit just shipped a new feature and everybody immediately started using it in production websites (why not?). Whoops, down to 90%; there was a webkit bug that was too gross to work around and would break the threading model. Wtf? 80%? What just happened? Ship it, quick, before it drops more!
The group of hackers gives up and starts a job board/social network site for pet birds, specializing in security exploit developers. They call it “Polly Want a Cracker?”