Thanks for your response. I appreciate that there's power within the tool. I'm just used to having defaults more carefully chosen. So you can whip up a simple EA and touch the least number of options. And fall prey to fewer unexpected side-effects.
fxD is a power saw without the blade guard. Even experienced carpenters make mistakes from time to time.
When the defaults are well chosen the operator needs to keep fewer issues in mind and can focus better on their current strategy.
Having an EA unexpectedly reach outside itself and modify other running EAs is troubling. Every simple fxD example EA I've seen online makes this mistake. That's not good.
The simple case should be automatically self-contained, not touching other EAs. To touch other EAs should require consciously making that choice.
fxD makes 'badly behaved' EAs by default. 