Never said it was unstable but it's not perfect either. You mention yourself that there can be issues when tweaks are applied. Since no tweaks can be applied to a non JB phone, there are less chances of issues.
Don't know why folks keep saying a JB is unstable. The user makes it like that depending on the tweaks applied to it. I've had my iPhone 5 JB since it came out (JB) and so far is been great
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All I'm saying is that most don't really need it. I personally have been there, done that and it's not for me.