When I think of a bush craft knife the first thing I think about is how well it will perform in an emergency and/or survival situation in a forest/mountain environment, since that might be the only knife I have. Everything is secondary to that. If this wasn't a factor then a thinner, kitchen-type knife would probably work fine, unless I had to baton with it. I almost always carry a SAK or multi-tool with small blades for the light chores, anyway.
The microbevel I put on my 4.5" blade is probably around 25-30 degrees, inclusive, although I've never measured it and am just guessing. A lot of people highly recommend convex edges, also. I put on a thin relief grind, though. I try to avoid durability problems by carefully considering the pros and cons of thinning before I do it, and test the edge afterwards. However, any knife I buy for wilderness use is high quality so I expect it to hold up well with a thinner edge. I also bring a sharpening hone on my wilderness trips so if there's an problem I can correct it.
The microbevel I put on my 4.5" blade is probably around 25-30 degrees, inclusive, although I've never measured it and am just guessing. A lot of people highly recommend convex edges, also. I put on a thin relief grind, though. I try to avoid durability problems by carefully considering the pros and cons of thinning before I do it, and test the edge afterwards. However, any knife I buy for wilderness use is high quality so I expect it to hold up well with a thinner edge. I also bring a sharpening hone on my wilderness trips so if there's an problem I can correct it.