I use the drawing tools in type authoring apps, like FontLab and Glyphs, quite a bit. The drawing tools in Illustrator are much more robust, but there’s one feature in the font apps that I really like much better than how Illustrator (or Affinity Designer) does it.
So let’s say there’s a shape made from a bunch of curves. Let’s also say the curves in the shape path are a little awkward and could be made simpler, smoother and a bit more harmonious.
Fixing this problem might mean removing some of the anchor points and readjusting the shape. However, removing an anchor point in Illustrator collapses the curve. In the type drawing apps, removing an anchor point results in the app recalculating the control handles of the adjacent anchor points to create a more harmonious approximation of the curve that was there to begin with.
It’s difficult to explain and even more difficult to explain why this matters. I never realized it was even an issue before I became familiar with the type drawing apps and noticed how often I came to rely on it for fine-tuning curved paths.