This^^^ because the feedback from SMART would be an overlap from the built-in SMART monitoring unless the plugin is doing something else.
The amount of writes varies quite wildly. If I set up the plugin with all my drives (24), if they are all spinning, then there is ~300 writes per hour (2.6M / year) according to the dashboard. If they're all spun down, that drops to ~20/hr
(under my test it would have been ~64,000 over the 9 days)