It's obviously the grandparent meant it as not a toy implementation. As in, non computer literate people can use it without complaining about broken sites.
The first 80% will take 10% of time. Now last 20% will take 90% of the time.
It’s exciting because Andreas is very inspiring and motivating and also the entire Serenity OS is very understandable and usable and basically a nicer version of C++. Just a browser would not be interesting, but a browser combined with a full exciting monorepo OS is
They are doing it though; it's "real." Perhaps you are setting goals for them that they are not themselves setting?
> can't compete
You actually can read about their goals on the linked page, though. They are not attempting to "compete" with Chromium.
> iphone
So don't use iPhone, and use a phone that allows you to use the browser engine you want to!