Tuning a filter used to mean leaving your lead list, editing the filter on its own page, saving, navigating back, and discovering you were one condition off. Repeat four times and you have lost ten minutes to page loads.
Filters and enrichment configuration are now edited inline. Change a condition and see the matching leads update in place. Adjust an enrichment's target fields and inputs from the segment you are configuring, without a round trip.
The practical difference is that iterating on a filter is now cheap enough to actually do — which is what filters are for.