The number of source of frustration and confusion amongst our users, when building Dashboards, is conflicts/inconsistencies between Dashboard and Widget filters. I have separately suggested that Sise...
I would like to investigate this further also. There can be major performance impacts from turning off all the filters on all the widgets on the entire Dashboard. Some filters may be hidden from the viewer also, and trying to sync those between the Widget and Dashboard could cause all kinds of issues.
Another solution you can look at is resetting the filters to default on reload, as mentioned here: https://community.sisense.com/t5/embed-analytics/how-to-reset-to-default-filters-after-refreshing-the-page/m-p/4185