Fix blending of strokes
As described in this discussion (from 4 years ago!) - https://forums.adobe.com/thread/1291256 - in most cases when you apply a blend to two strokes with any profile other than uniform, the intermediate stages of the blended strokes do not have any profile applied to them. I believe this has been a problem at least as far back as the introduction of variable width strokes, and has still not been resolved. This seriously hampers the usefulness of the blend tool and massively increases the amount of time required to produce the desired effect.
Blending paths with different stroke profiles, created with Width tool or picked from the panel, now works as expected — intermediate steps all have correctly blended profiles applied.
Seriously this is so buggy, sometimes it works then it won't. This is BS