Hi!
When I export my font, new nodes appear and change the design very slightly.
I’d like the design to stay the same and keep the number of nodes I’ve set in Glyphs (which is as small as possible).
My export settings are OTF, hinting + overlapping boxes unticked.
TrueType paths are made with quadratic Bezier curves (the handles between nodes always connect to each other), while Postscript paths are made with cubic Bezier curves (the handles are independent, as in your screenshot).
There’s a lot of discussion about this particular issue in this StackExchange question, but you’ll probably get more practically useful answers here.
My client wants to the share font via Illustrator to avoid giving the font file, contractual matters.
In any case, the difference between the glyph’s drawing and the exported (non-vectorised) font is quite significant in some letters (see the X, the grey is copied from the glyphs, the black is the non-vectorised font in Illustrator).