That's also a fairly pared down version of the Chrome engine, designed for embedding used by tons of projects, like games for their in game lobbies or OBS for their Web overlays.
Personally, my problem with CEF is that it keeps Chrome fairly vanilla - and there's a lot of things in there that you wouldn't want to include in your user app.
But there's a reason they did it like this - if they really took an axe to Chrome's codebase, they'd basically lose the ability to upstream new versions.
Zebkit on the other hand sounds like it's gonna be more granular - we'll if they cope with this better, but I think there's definitely a market for a much more lightweight browser engine that's broadly compatible - for example, just getting rid of sandboxes and process isolation would be a huge but incompatbile change.
So would be dropping large modules like WebRTC or video playback or webusb or whatever, that I'm sure 99% of apps don't end up using.