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Unfortunately the "tapped depth" feature is now broken with respect to this context. The system has no idea how long the tapped section is in the blind part.

Hopefully I'm missing something, because I use blind in last holes a lot. Also, I used custom hole sizes quite a bit too, I work with laser cut parts and the holes aren't always needed on nominal drill sizes. 

You gotta watch this:

And then use these:Greg's Curve and Surface eval tools are here:

https://cad.onshape.com/documents/d675d2ccbcf6336cf8ef52bb/v/ca0fbc4c032a6dc1739420a2/e/853bddb5d9a1fffded23ae80

This is my 3rd generation design for this part, it's a 2016 BMW R9T (8 years old):

This is the most primary surface in my design, Greg talked about these in his video and getting these correct is important. Most organic designs will have primary surfaces:

This is actually a good single span surface patch with degree 3 & 4 to create it's shape.

This is how my old design was created using a simple loft through 3 curves:

Turns out this surface is terrible:

Instead of using a 3 curved loft to create my primary surface, I switched to a 4 sided boundary surface:

This new boundary surface is off by .309 mm using a 4th order target and that doesn't matter for the design. The red dot in the image above shows maximum deviation between the old & new shapes.

This middle curve defines where the part matches the seat:

I can't remove it or ignore it.

So who cares about all of this? I can't say that with this small printed part you can see a difference between clean & dirty surfaces. If you chrome plated these parts and knew what to look for, you might see a difference. Maybe with a larger shiny red car you could see a difference in the surface types. There are benefits though, what you do see is a speed up & robustness in the model.

Time to rebuild clean surfaces is 5.03 seconds:

Time to rebuild dirty surfaces 6.01 second:

This is a real use case utilizing the newer surface tools. It pays to get it right because when designing organic shapes, you rebuild a lot and you tend to push the design to it's boundaries. You have to use Greg's tools and focus on spans & curve degree for the surfaces created keeping the surfaces lean and mean.