If only there was a language that let you modify the interpreter on the fly so you could do this as part of normal execution...
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I would say it's a good thing, I don't want to see a hundred of half baked, badly tested and vaguely document DSL with no decent tooling support.
When this comes up I usually link to the work of Alan Kay and others (the very mystical sounding STEPS project at VPRI)
""" The big breakthrough is making it easy to create new DSLs for any situation. Every area of the OS has its own language (and you can just add more if you feel the need) so that the whole OS including networking and GUI is very compact, understandable, and hackable. This particular project focused on compactness, just to prove that it is quantitatively more expressive. """
comment by sp332 https://news.ycombinator.com/item?id=11687952
final report from 2016 https://news.ycombinator.com/item?id=11686325