Because Matilda's lands are agnatic-cognatic, instead of agnatic, then other factors could play a part in it as well, beyond just content. Diligent vs slothful, for example, or else a combination of the wife's traits (wive's with at least 2 of diligent, proud and brave, with 10+ in martial and intrigue, in any system besides purely agnatic, can be hard to displace without them being in other difficulties). Having her content does make it much more likely, but that's not the end all and be all. Having the ambitious trait clears more obstacles than her being content. Although her being content will make it far less likely that she'll retake power!
There are many reasons. But I guarantee if it works for one couple, it works for all couples. Agnatic law of course, removes almost the entirety of the wife's contribution to the various personality matrices, and only determines possibility or not based on the husband fitness or unfitness.
That's because, in order for the husband to exercise real power, as CK2 represents the ruler as having, they must be able to bring not just their wife, but her barons into line. CK2 doesn't (yet) have the means to show partial and nominal degrees of suzerainty or co-rulership, so I erred on the side of caution. If a husband is in charge, it's because he should be in charge. if the situation would have been more vague, then the most accurate portrayal is leaving his wife in charge (even if his wife is really dominated by her barons...but that's a different event chain, such as the demesne laws I'm working on, which will penalize weak female rulers significantly.)
Yes, they can. But they can only do so against player female rulers who are at least duchesses. And it will leave you with one county, provided you had more than one county to begin with. Sadly, the only route for a player to be game-overed, is to be a one province duchess, queen or empress with a landless husband who successfully usurps her...the AI deals fine with it, and often even reasserts power eventually, but CK2 will either game-over you, or switch you to another extant, landed member of your dynasty, such as a son or brother.
I agree. Once Cybr makes Immersion compatible with SMWH, I'll probably stick with the above combination for here on out.
In fact, my game is already modded to have Immersion compatible with SMWH, since I like it so much in own games, but can't do without SMWH. Although, it's a much worse job than Cybr will do for the official release. I'd say those three mods, and TPTT are my biggest inspirations. CK2+ was great as well, but I feel like there were design decisions taken with it, that made it incredibly difficult to adapt or make it compatible with anything else.