@mapperz Adding layer blending to Pro is a great feature that QGIS already had. To be fair, ArcMap has an eyedropper tool going back to 9.x (I think), and for sure in 10.x. And both are just copying that tool from photo editors. Both are just adding new tools people want.
@smallmelo Try loading data into PostGIS and create "views" with ST_Simplify or ST_SimplifyPreserveTopology to generalize the data. When the data is updated, the views automatically update themselves. If it's really complex, use a "materialized view" to save on display time.
@geoafrikana Try this: 1) Make Categorized symbol from expression "field1" || ',' || "field2". 2) Create 2 copies of virtual layer from source layer. 3) Symbolize virtual layers on 1 field each. 4) Add legend to Layout and remove "multivariate" layer from legend items in Item Properties.