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I'm not familiar with redwood. My understanding is a big issue being tackled by decouple is web, which the present solutions are currently diverging into a DOM approach and a Canvas approach. A lot of the community is getting excited about Canvas as a solution for a write-once use-anywhere app, but using Canvas on web does have a few limitations (not the least which means on ultra widescreen monitors you're probably allocating a giant texture which may be a waste of memory). Decouple is trying to do something clever where it would target the DOM.