That wasn't what they were saying over at the Mutant forum, and I defer to their knowledge (not having written one).
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I don't know what this "mutant forum" is, but having designed a RT, TB and and a system which functions in both, I can tell you a realtime system is more difficult. Easily.
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Yeah, I'm not a member and I don't frequent it, and I read it a while ago (over a year), but I think it's one where developers (from Bio?) go.
Anyway, IIRC, the gist of the reasoning was that Real-Time was a matter of setting off all the little procedures (according to their own rules and timings); Turn Based required additional synchronisation administration on top (to make sure each process only did one turn's worth of action each turn).
What are your experiences?