I agree with your take of the Hanse interior. It is a shame, because there is a lot to like about the boats, but the interior quality and finish is a deal breaker, at least for me. The 415 I was on had such thin flooring, the gaps would pinch your bare feet. It is good to know, that Dehler hasn't lowered its quality standard since its marriage with Hanse, unlike Moody.
I am however perplexed at your take of the HR 412. I have not seen the 412 yet, but have been on quite a few HR's and crewed on a 372. The build quality has always been exceptional, and the boats are designed for the reality of sailing, and life aboard underway.
Why do you say the HR is strictly a 2cabin boat? There are 3cabin versions. From a storage point of view?
Let me add something negative about the Hanse: They don't have an water proof bulkhead between the rudder and the rest of the boat. Has you know a violently broken rudder can be one of the reasons for water ingress on a boat and several had sunk that way, including at least one Hanse. That is also a deal breaker for me.
Regarding the HR 412 being strictly a 2 cabin version, yes, it has to do with storage. Any boat that has not on the cockpit lockers enough space for the storage of a liferaft, fenders and some ropes will not fit me and that is very clearly the case with the 3 cabin version of the HR 412 that I had visited.
Some sail with the fenders over the deck. Not me, it is not only ugly as it complicates maneuvering and it is just plain dangerous with bad weather.
Regarding the interior I had not said the interior was of bad quality, I have said that the interior design was average while other quality boats have not only high quality build interiors but also very high quality designed interiors. I am not talking about style, more modern or conservative, I am looking at it as a professional, I mean you can have high quality in design no matter the style.
I guess that HR is one of the boat builders that did not understood yet that as the same way that the hull and rig design should be left to the best professionals, the same happens with interior design. I bet that the HR interior is house designed. No matter the quality of finish that is not enough to warranty the best overall quality and they are going to pay for it. XC yacht has a better design quality as well as others. Just take a look at a comparison photos with the much smaller Solaris 37:
and regarding 360 pictures, have a look at the HR 412:
and at the older winner 12.20:
or at the Moody 41:
or at the Jeanneau 409:
or the smaller Xc 38:
Note that I am referring to quality in design, not style or build quality and I am not saying that HR has bad quality in design, just average. Older boats do not have trough hull views but they can mount them at request.