Data breakpoints are useful when you want to know if a specific thing changes, but fast watch window is much better in most circumstances so you can just see _everything_ that changes as you step, without having to guess in advance.
I want to say that it also doesn't handle rep instructions... I could be wrong about that, but I _believe_ it is not "any time this address changes". I think it's more like "any time an instruction _specifically_ mentions this address". But again, I could be misremembering.
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So it's really not the kind of thing you want the IDE to make promises about that are fake. The programmer needs to know what they're doing and understand the limitations or they could misinterpret a run where the breakpoint did not hit.
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