[rnhmjoj]

> My impression is that it has been stuck in bug fixing/dependency churn for a long time now

I don't think it's just your impression: it's exactly what happened. Depending on Qt for the rendering engine means the browser has been tied to the painfully long release cycle of the whole of Qt. Quickly fixing bugs or implementing new features is hard, they have to hack around limited APIs, beg for more and continually fix new bugs introduced by upstream (both Qt and google).