From what I've read about the chemistry of salt in baking, excess salt only causes a problem in the chemistry of yeast based products (breads) and they rarely includes butter. For most butter based baked goods (cakes, pies & pastry) too much excess salt would only make the final product taste too salty. However, the amount extra salt you may add due to salted butter sodium level uncertainty will rarely ever be enough to cause that, esp. if you cut back on the the quantity of pure salt you add as well.
Your explanation of salt vs. unsalted butter, in general, baking and cooking was very informational and written so that all folks could understand. As one who is new to having my salt intake monitored this was the best article I found on the internet.
Thank You
With Appretiation,
Carol Caruso
I was told decades ago by a dairy farmer that unsalted butter was the best quality butter and as the quality of the butter fat went down the market added salt to improve flavor. Is this an old wives tale? I can’t find any proof about what I have always believed.