Describe the feature:
Simplify reduces the complexity and weight of a geometry using the Douglas-Peucker algorithm. It in general reduces the number of vertices in a polygon, multipolygon, line, or multi-line geometry. It takes 2 arguments, the geometry and the tolerance.

This functionality already exists in spatial db like PostGIS and can speed up geoprocessing as well as visualizing spatial-geometries.

See: https://postgis.net/docs/ST_Simplify.html