Clarification for `pollOnStart` parameter

Hi all,
We have recently started with the Experiment SDK. I was expecting `pollOnStart: true` to instantiate a poll mechanism that would fetch the user flags and variants on a regular basis. Inspecting the network requests and the source code, however, we found that the flag definitions are fetched every 60 seconds, but the _values_ for the current users are not re-evaluated automatically as part of this process.

I wonder, what is the purpose of fetching the flags so often without re-evaluating the flag values? I expect the value to change more often, as this depends on user properties/events that might affect the target audience of a variant.