Seismic Bracing Any Help When Building Isn't?

I know where I stand on this topic, but I'm interested in hearing other opinions and seeing if I'm wrong.

An existing, one-story, 35+ year old building that is a Seismic Risk Category IV building was not build to resist lateral loads. The building is being altered under a Level III alteration in the International Existing Building Code (IEBC), and is not required to be structurally braced nor is the sprinkler system required to be retrofit with seismic bracing.

My question is, is there any benefit to bracing a fire sprinkler system where the building is not structurally built to resist lateral loads?

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