I think it would be useful to define all of your arcade expressions in one file and call those expressions in the popup where needed, instead of having to create expressions in the 'Attribute Expressions' box individually. Something like this pseudo code:
exp doThisThing {
some arcade expression
}
exp doAnotherThing {
some arcade expression
}
Then when I'm building out my popup, I could just reference the defined expressions in the custom popup configuration.
The benefit of this approach would be that I could edit expressions all in one place. It can be cumbersome to make changes to multiple expressions when they are complex and you need to make changes that apply to all.
Bonus if you could define some things globally that could be used in multiple expressions so you don't have to do it for each individual expression.
Edited to note that @PeterKnoop's explanation below is a good addition.
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