> Yeah, but is it even good?
Yes, it is. Is the only solution which was able to replace several outlines + highly specialized solutions like OmniFocus for me. And that, being a simple text outliner. It has no point to compare it to some hypothetical solution which does not exist and may never exist at all. We need it here and now.
> and that's written in lisp.
It may be more of an artefact of the time when emacs was created than some intrinsic advantage of lisp in general. The way I see it, the advantage of emacs is that it is mostly written in the own script language. Would it be written in lua instead (a more common choice these days) not much would change as long as you can eval code on the fly.
> Or are you saying that Common Lisp itself is a problem?
I would not say that CL itself is a problem, but on the other side the lisp community likes to write essays about the perfect software in the sky but delivers mostly nothing. I cannot do otherwise than compare it rust, which is very young language compared to CL, but the community cranks out amazing and useful software on a weekly basis.
So, yeah, while in theory nothing speaks against amazing software being written in CL (as in any other language apart from brainfuck, really) in praxis it raises a lot of red flags for me.