The source engine is a bit old. They've steadily improved it, but I believe they're gonna need to do a major overhaul before Episode 3 is released if they wanna avoid accusations of releasing "outdated" software. It could work if they released it now, but since there's no whiff of an announcement date yet, I figure it's still due for release in the distant future and the problem of the age of the source engine which might be a minor issue today is only going to get bigger in the future.
I guess they're working on it though!
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