It might be worth moving the latest updates to the top of this answer. I had to go through the whole thing to get to the best answer, flexbox.

It is much easier to track what is going on within the activity. Instead of transporting additional state via ctx, you expose the outcome via an additional end event.

So why the over-complication? What we got now is replicating a chain of && in the former version. This time, however, you will know which condition failed and what went in by using tracing. Look at the trace above - it’s impossible to not understand what was going on.