That's why we have subevents.
Surely we have sub-events, but that's not the reason we have them.
The screenshot was a minimal example, a very simple one. I should have posted something like this:
Again, I know it's 'possible' but not with single sub-event, not even with multiple same-level sub-events because it needs to follow that order.
So for a long series of actions (especially with wait actions) if we have to skip several multiple actions with different conditions each, That would require MANY layers of sub-events... that's not efficient, and doesn't look right, nor easy.
Now imagine the same scenario with that [System] conditional action available. Wouldn't you use it?