@MErikReedAugusta This is an issue the ArcGIS Pro Topographic Mapping team experiences as well, on an even greater scale; we have around 1,000 unique symbols in several of our products. Our current workaround is to create what we refer to as a OneForOne database that contains a feature for every possible symbol (though not every possible attribution combination that could lead to each unique symbol). This allows us to directly symbolize everything in the Arcade and rebuild layers as needed. Having spoken directly with the teams responsible for this functionality, it's definitely a firm limitation for now, though conversations are ongoing for what different workarounds could look like. (Just to get ahead of this question: our method is not polished or published, it's not an exact science and requires lots of testing - it would not be of great help to users unless they were handling hundreds of unique symbols, though we do occasionally work with customers in which we consider employing them.)
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