The Expression Builder node in Workflow Automator could benefit from three improvements:
- Fix the bugginess when pasting text
Whether you copy/paste from an external text editor or even text from within the Expression body, the node has a hard time with pasting - Switch from Sans-Serif to a
monospacefont for readability
The font kerning in the Expression body makes it hard to distinguish between characters especially when they are multiple parentheses next to each other - Conditional coloring for expression variables
Distinguishing text (placeholders, numbers, operands, strings) with different colors in a expression formula would make editing the expression easier on the eyes
Just take a look at the formula bar in Google Sheets — if you mimic that style, expression builders would be way easier to work with.



