* Python is much slower than SBCL (yes, even if rendering is done by Blink); including the lack of threading
* Bookmarks are pure crap, they don't have tags nor directories to sort them better
* Less hackable (e.g. something that should be possible in Nyxt: https://github.com/qutebrowser/qutebrowser/issues/3933)
* Massive gaps: https://github.com/qutebrowser/qutebrowser/issues/2328 https://github.com/qutebrowser/qutebrowser/issues/2492 https://github.com/qutebrowser/qutebrowser/issues/5731 (!!!)
* Per domain/URL settings never progressed further than the initial batch of properties: https://github.com/qutebrowser/qutebrowser/issues/3636
* Adblocking is better than hostfile but still missing a lot compared to uBlock (https://github.com/qutebrowser/qutebrowser/issues/6480). No script blocking matrix like uBlock "advanced mode" at all.
My impression is that it has been stuck in bug fixing/dependency churn for a long time now. Switched to Firefox while waiting for Nyxt to be usable (apparently, Nyxt 4 will be it).