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Been a while since I was in this area, so I may be off base. But my knee jerk thought on Ubn is getting another valuable data point on nuclear structure. We’ve got a magic number at Z=82 and one at N=126. Do we get it one at higher Z? This doesn’t answer it directly, but it’s a step along the path. And at the very least is a great data point for confirming/constraining various structure models.

Genuinely interesting comment, but not really an answer to OP's request for applications.

There are some predicted islands of stability at various points further out in the periodic table: https://www.scientificamerican.com/article/the-quest-for-sup...

Generally these newer elements themselves aren't directly applicable to day to day objects or tools given the difficulty in creating even individual atoms and the short life of said atoms. It's almost completely about advancing the general atomic and subatomic understanding by pressing at the edges.