The ability to add a new filtered view to quickly access it just like the grid, calendar and other views.
I think it’s not the same. Grid and Calendar are formats. Filters manipulates what data you see, and you have a lot of possible combinations: fields, conditions, values… When you click on Filtered View, what should be presented? It’s impossible to know
Seconding what Elias said—and I’d like to add that you can apply filters to any kind of view, be it kanban, calendar, gallery, grid, etc.