Dense, well-insulated wooden house without plastic? (Vapor barrier)

It is not about the overall airtightness of the building but about the airtightness of the foil. Just a wrongly driven nail, as an example, is enough to let moisture into the insulation and onto the wood.

I believe poor workmanship is generally disadvantageous; this is not limited to timber frame construction.

You can carry out the (first) blower door test before the installation layer is closed, then you can even make improvements at weak points.

You are of course right, other construction methods do not have a membrane on the masonry that can be damaged, and in case of moisture problems, the defect would only need to be fixed and then dried. With timber frame construction, you have a completely different issue. So significantly higher likelihood of occurrence with quite a large impact. I consider that worth mentioning.

Hello Specki,
take a look at Dübelholzbau in Oberstadion.
Regards
Willy54

Timber frame construction

Thanks ^^
I could have thought of that too.

Dowelled timber construction in Oberstadion

I'll have a look at it.

It is the same with us: Büdenbender Hausbau. Built near Aachen.

I would advise you to talk to a carpenter near you about what is possible and, above all, what makes sense. We had a similar approach and also didn't want any foil on the walls. We have now also glued OSB and placed an I-level in front of it. In my opinion, this is the best solution (at least for us). You probably won't be able to completely do without a vapor retarder membrane, especially on the roof. But a professional can tell you more about that and also show you the options. Regarding airtightness, we averaged a value of 0.63, although the tension frame was not 100% in the door and window sills had not yet been installed.