Webkit IS competitive ... its using open source as a standard.
Man I swear nobody knows nor recalls nor even took the time to look at mobile browsing on phones or smartphones prior to 2007?!!!
1. J2ME browsers ruled the day on feature phones
Feature phones: SonyEricsson (SE), Nokia S40 phones, Java phones and anything from LG, Samsung, etc under $200 prior to 2010.
Browsers: native to Nokia or SE while others used J2ME-based browsers like Opera Mini, etc.
2. WebKit Browsers on devices:
The very FIRST implementation was created by engineers at Google and Apple (very hard now to find the source of this as the internet keeps overwriting facts). The first use in a smartphone was indeed on the Nokia S60 (Symbian OS based) smartphone model called the N80/N80 Golf Edition. The next model was featured on the Nokia E61 ... which you ALL say during Steve Jobs original iPhone presentation. Guess what?
Apple worked with Nokia to create that browser that had a feature called Mini-Map which showed a zoomed-in section within a 1/3RD box on the small 2.3" screen that made it easier to view the full web-page versus showing a full screened zoomed in web-page, which was also an option. Jobs incorrectly and falsely stated that Nokia's S60 Browser's MiniMap was the 'baby internet' ... (babyinternet = wap2.0) ... this was FALSE. Nokia's S60 browser rendered pages exactly as the iPhone's webkit browser - as each used the same Webkit engine. Just Nokia had a VERY small screen.
This has been a standard over a decade and still is.
What is NOT being questioned or looked into here is:
what customizations are the Chrome/Edge and FireFox browsers' are using native only to each that should be considered as non-standard and proprietary to lead to other restrictions against them?