Hi Jonah,
Network requires a lot more setup work than Blend does, because you have to create all the curves you want to use as a separate step. If you have something where you want the created surface to have a kind of even proportion between the edges then Blend is the right tool to use to get the job done more quickly.
Why would you think that Blend does not fit within tolerance? In MoI the Blend surface is fit to a tolerance of 0.001 units so that it can be joined to the other surfaces you are blending between.
In Rhino it should also be getting fit to the model tolerance as well, if you have run into cases where using a Blend in Rhino did not produce a surface within tolerance, then that's just a fitting bug in Rhino that you should report to them so that it can get fixed.
There are lots of ways that a fitting algorithm can get fooled into thinking things are within tolerance when they actually aren't, I fixed some bugs in this area for MoI v2 a couple of betas ago.
There is no reason to think that you can't use Blend to produce results within an acceptable deviation, it should produce the same accuracy as any mechanism that involves an adaptive fitting process like Sweep for example.
- Michael
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