Don't require track mattes to be above the layer it modifies (and also allow re-use)
Requiring a track matte to be right above the layer it modifies seems like an archaic convention at best. Get rid of that requirement and make them like parent layers which can be anywhere and used by many layers.
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Michael Rogowski commented
Use the Set Matte effect! The only drawback to it is that if you're using it on footage layers or solids that don't have the same dimensions, it doesn't work as expected. Still extremely useful for vector/shape/text layers though.
Justin Hemsley commented
Oh please! I've been saying this for years. This would be soo handy!