Well, that's the thing when we're talking about hobbyist FOSS development. There's no bosses and no money involved to get a developer, point them at specifications, and say "implement this top to bottom." Instead you're going to get people implementing the parts important to them and/or fun to implement and/or relatively easy. Can a new browser engine compete with the big boys when it's developed like that? No, but maybe it can get good enough for casual use, and since it was mentioned in another thread here that Kling actually has hired a dev to work on Ladybird/LibWeb, maybe the whole thing's moot anyway and we'll start seeing things like text on an SVG path and other stuff which I imagine is not so fun to implement get done in the near future.