As this handy Github project indicates, the three year lifecycle was announced from the start.

Is this a good thing? Obviously not! Are customers be surprised? I sure hope not!

Unfortunately, the Surface Duo is a very weird device to support, so I don’t think it’ll receive much love from custom ROMs. Treating it like a tablet with such a fold down the middle doesn’t make any sense, but I think foldable UI isn’t designed to support the two screen model either.