I'm a big provisional fan of AoA. Provisional because I think that for GA there are a bunch of best practice issues still to be sorted out and, whilst clearly you can do without AoA, you can't actually do without airspeed - if only to determine the rotate point. You also need speed or altitude in the cruise, as reference solely to AoA is a recipe for phugoids.
The military don't use AoA exclusively - they do usually use it for approaches and some combat manoeuvring in fast jets. For various other things they also use IAS and/or IMN.
Testing out IAoA instrumentation and developing some best practices has surely to be an ideal use of the new CAA E-conditions?
G