Hi @Gijs , as much as I want to be optimistic about the future of Rhino as a NURBS surfacing program, in fact I see really small progress across the recent Rhino iterations. Since Rhino 4 there are nearly zero improvements in the main NURBS modeling tools, especially “Blend surface” and “Match surface”, as well as “Rebuild”. If I remember correctly, “Match surface” in Rhino 4 was even downgraded compared to Rhino 3, by removing the “Refine match” option.
The examples in my last post clearly show lack of essential functionalities that otherwise could make Rhino a much, much better surfacing program.
I want to be able to convert surfaces to Degree 5 with 6 control points to work with clean geometry, but Rhino 7 destroys the intended shape of the surface and instead converts it into a chaotic mess of control points placed at extremely distant location, against any logic.
@eobet also pointed out that huge bug in “Rebuild”, as did several other members here. Still not fixed, despite being one of the most important tools for NURBS surfacing directly related to the surface quality, file size and speed of work.
The “Interior shapes” option of “Blend surface” is producing highly inaccurate results. Take a look at this example.
Other inconvenience of “Interior shapes” is that it basically makes it impossible to adjust the major end handles in the way Rhino 5 allowed, because the preview blend surface gets loaded with extra dense handles that will not blend smoothly between the end handles. While the “Interior shapes” allow for a local adjustment in a specific small area of the blend surface, 99% of the time the users prefer to be able to adjust the general shape with the end handles only.
Turning off the “Interior shapes” option basically makes the Blend surface lose its ability to match to the input surface edges. Again, Rhino 5 had no problem with that.
I made plenty of proposals in the topic dedicated to “Blend surface” (I posted a link to it in my last post above), so I think that the Rhino developers already have more than enough ideas to work with.
The video I just posted here also shows another bug of “Blend surface”: unreliable preview that’s way too different compared to the output surface. Note that the control points of the blend surface are a total mess.
Another bug seen in this video is the automatic switching to the background program (Firefox in this case) while trying to place a floating panel inside Rhino’s viewport. It happens every time in my Rhino 8 WIP.
Also, lack of basic letters in some icons to distinguish them easily from the crowd of similarly looking icons. Now that Rhino 8 WIP removed the ability to draw custom icons inside the program, this becomes an even greater issue than before. For example, “Blend surface” could have a “B” inside the icon, “Match surface” could be marked with “M”, “Loft” may include “L”, and so on. The funny thing is that as some point of the same video I was confused where is “Blend surfaces” and spent several seconds into looking like a complete amateur who sees Rhino for the first time ever. 
Those few major icons must be really easy to spot.
