How do you implement a try/catch in Appian RPA no code environment?

Think of Appian RPA as a bandaid to integrate a legacy system. Use standard Appian processes for the more complex logic.

I disagree that a 'catch' block is 'powerful' in the longer term. Most of the time they are a 'code smell' because they imply that a developer has not checked the assumptions about initial conditions / data in their code prior to running it. The reality of nearly all code I've written and reviewed is that a 'catch' block is just a way for developers to ignore problems by logging them to deal with later. Sometimes that is all that can be done (e.g. leaky abstractions, where a lower-level library throws a generic exception with no relevant means of handling it in a specific way), but most other times it is far more performant and maintainable to check assumptions ahead of the try() block.

The lack of generic error-handling in Appian, while absolutely frustrating at times in early development, is a way to force developers to properly address errors in their code as part of productionization. I do wish Appian would formally support try/catch (specifically to gracefully handle issues with data-driven dropdowns), but I also know developers would simply abuse it.