Totally agree and surprised at the lack of AOA in light GA also that A5 looks a great little Sea plane and a lot of fun.
We have an AOA on the Citation and you could disregard the ASI and just fly the gauge for more accurate speeds and approach.
My only concern without reference to another instrument is if the AOA instrument failed or false read which could land you in a dangerous mess
So I would still want an ASi and preferably 2 separate AOA to cross reference
Pace