There seem to be different approaches in this regard:
* Dolphin uses one process per window
* Konsole uses one process for all windows, but sometimes there are also more (for example start another Konsole process with KRun, which happens when opening Konsole with the context menu in Dolphin)
* Browsers often use one process per tab/site

So is there a consensus regarding the approach? Or is there a direction, where it's probably heading in the future?