When using unique values when symbolizing layers all other values should be turned of by default. If I for some reason want all other values to be visible I should manually turn them on.
Every time you change the symbology of a feature class to "Unique Values", it automatically adds a symbol class for <all other values>. I think this is unnecessary and a waste of time to constantly remove it. If you have good data and are symbolizing using a field with no null values, it just adds an extra step to remove it everytime. Even if you didn't still seems like the default should be to add <all other values>, not remove them. A simple solution would just be to add this to the ArcPro options.
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