It's great for including diagrams with your code, and is great for sequence diagrams, but I wouldn't use it for more complex communication diagrams where it starts to creak a bit.
I've mostly been using it for sequence diagrams, and yes, it's is great for that! I haven't tried modeling anything very complex as of yet, but I'll see how that goes.
Yeah, I think this is a convenience tool to make the easy task easier. The complicated task is still probably pretty complicated.
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