Frequency of global nodes changes in AW

I thought I read once upon a time that the global nodes we choose for each BG would be changing each season. Is that not the case? If not, what will the frequency to updates be that we can expect.
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@SCZ is it though?
We don't have a set cadence for when we'll be changing/updating Defence Tactics buffs, though we don't want them to get too stale. We'll definitely let you know before we change them though.
Maybe something could be added to make it advisable to use a variety of Defence Tactics? Like there's a weaker version of each Defence Tactic that is placed if you use the same Defence Tactic too often? I dunno... just some feature that makes it beneficial to use a variety of Defence Tactics.