My finished thicknesses vary from 3/32" to roughly 3/8" depending on what is expected of the blade. Some of my blades see prying, batonning, chopping, digging, hammering, etc... they are made for that purpose. Some blades are for slicing, skinning, etc... they are designed for that. Same goes for whittling, kitchen work, carpentry, etc...
My "Bush" philosophy is minimal tooling, maximum versatility. If i can afford to take the right tool for every task, I do... but mostly, I grab for the one tool that can get me past anything. With enough experience the shape/size of that ONE tool is not as important.
A long time ago, during some training with a new group, I was ribbed about the "sharpened prybar" I brought. They informed me that I was at a disadvantage lugging a 1/4" thick, 9" long blade around. Part of the training was making an expedient shelter and enough firewood for 2days. We were only allowed our knives. I thought it was ironic that as the week progressed, the criticism changed to pointing out that I had an unfair advantage with my "hand axe". I will mention that there were times I felt a smaller, thinner blade was more appropriate, obviously. That is only one example to defend the prybar. There are valid arguments against it as well. My point is that you need to ditch the dogmas from both sides of the fence and go FREEBLADE.... cuz there ain't no fence!
