thisComp support in (responsive) MOGRTs
Right now it's not possible for a Motion Graphics Template to detect the containing sequence size.
Combined with the AutoFrame effect MOGRT designs could become resolution or aspect ratio dependent by alowing the creator to use the thisComp Expression in MOGRTs like in normal After Effects compositions. One step further on the way to the responsive video workflow.

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Steve Ogden commented
Agreed. This would be huge! The best workaround I've found for now is what I call "The 1920 Method™". I design most of our bumpers and end cards at 1920x1920 and export the mogrt at that size. This really only works when your composition is centered and simple. But as long as your editors are standardized in their resolutions, a single MOGRT works for all the standard ratios. The 1920x1920 MOGRT can be dropped into 1920x1080,1080x1920, 1080x1080, etc. and fit nicely without scaling
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Staffan Erlandsson commented
This would be fantastic. Been searching for hours now to find out how to achieve this but realize it isn't possible.