Tangent Constraint or Advanced snapping system
I work in Illustrator all the time and I ask my self why or how can I snap a line or a shape to the tangent of another shape like Autodesk AutoCAD's "Tangent Constraint", some say that I can start with the Line Segment tool and go from there building the shape, but this option will give me a limited movement and it's not practical like if we have a tangent constraint in Illustrator so we can build logos and shapes more easier and that will make illustrator go to perfection more and more.

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Since you are here, please also vote for this related request about the ability to actually add points at tangents:
https://illustrator.uservoice.com/forums/333657/suggestions/33438667 -
Avana Vana commented
Seriously. I can't believe this is not yet in Illustrator after 20 years. Basic AutoCAD like snapping is a necessity.
Besides this, you also need to be able to snap to a line extension BEFORE you drag a line out, for example to plot a new point with the pen tool that is co-linear with an existing line. I can't say how many times (probably in the tens of thousands) in my career when I have had to drag out a construction line extension just so i can start a new line that is co-linear, or at least starts co-linear with an existing line, and then delete the construction line when i am done.
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Jean-Michel Le Goff commented
I agree, and asked the same thing thing to be added as options in smart guides from Glyphs (revealed in the last Beta version available.
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Andreas Tagger commented
Yes please. Why is this not a boiler plate feature of a program that has been around for 20 years +????
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Anonymous commented
Adobe, you need to look at professional CAD software in general. Illustrator ***still*** lacks some fundamental line-based drawing tools, like vector trim, offset, tangent detection, and so many more.
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Jeremy commented
I'd like to request a Smart Guide when drawing lines for when you are over a curve and the line is tangent to a curve.