This might be a very “specific to me” problem, so I’ll outline my process and see if there’s an ideal solution.
I use Glyphs, primarily, for lettering design. More often than not a logotype or some specific string of letters that will likely never change (i.e. I don’t “need” the type to be functional as such).
I usually draw each letterform in its own assigned glyph, so that I can edit one at a time and space as I normally would (unless it’s some sort of complex script or composition where just using a single “Glyph” as an artboard makes more sense).
When I get my typed out string of letters feeling just right to the point where I’d love to just copy/paste the whole thing into Illustrator and start playing with color, treatments, whatever, I can’t because because each Glyph is separate, so naturally I have to export the font and then do some fussing in AI to get it feeling how I had it in the first place (not to mention, the added clutter of having to export a new test font sitting around every time I want to make a small edit).
It would be awesome if I could export (or copy) my whole working window of glyphs as a single object to paste into AI and play a bit more. Having typed this whole thing out, I acknowledge that I very well may just have a stupidly specific process, ha.