I have just (above) summarized the 'non-issue' for you. There is no "problem". It is a feature of Windows 10 (Wi-Fi) to function as I have described previously. Microsoft have not addressed the "problem" because for them it is not a "problem", it is simply
a matter of people not understanding the function of Windows 10, in particular in regard to Wi-Fi and the 'auto-connect' functioning.
There is a saying that the customer is always right, so if the customer expects to be able to toggle the 'connect automatically' option for a network they're not connected to then you should seriously consider implement this. Saying that the customer has got
it wrong is not the most customer oriented strategy, especially when implementing it won't hurt the way things work too much.
Another way to look at it would be that if the computer doesn't connect automatically to networks it hasn't connected to, then
* Having a tick in the connect automatically box next to a never connected-to network by default is a bug, because it doesn't connect automatically to that network or even try.
* The tick should only appear upon the first connection to that network (unless there is an option to not do this, which I'm not sure there is or should be).
* If the user unchecks that option, then the computer should remember this the next time it connects to the network (this bit is currently the case).
Another option is to get rid of the checkbox altogether until the first time a connection to the network is made.
NOTE: First time includes first time after forgetting about a network.