Balkanisation refers to fences within one’s borders. It’s fragmentation that leads to less wealth, less security and eventually a loss of sovereignty to a powerful neighbor who notices.
Looking at it from the Slovene POV (which ultimately benefited from the dissolution of Yogoslavia, occurring within my/most lifetime), local industries/GDP benefitted greatly.
Currently, the rest of ex-Yugoslavia countries don't seem to do as well as Slovenia, and the main difference is date of joining the EU...