I beg to differ, and kindly don’t assume I am ‘obsessing’ with anything, other than explaining the question so people understand what I mean.
Yes, it is a hack. I.e. to use something not in accordance with it’s original intention or purpose, for another purpose. I have seen the screen where you create “local accounts”, and from what i have so far been told by users who looked into it for me, the only way they could see to be able to create “local folders” (i.e. ‘on my computer’ folders rather than synced imap folders (I don’t use POP)) is to use the “Create Local Account” function, inside of which are fields to fill out ACCOUNT DATA (like server connections etc).
I have no such accounts. I just want local folders, and it SEEMs like the only way is to ‘use’ that local account creation process to make a bunch of folders appear (inbox, drafts, sent, trash, etc). IF that is the only way, I don’t wish to proceed with Evolution. If that is NOT the only way, I do wish to proceed with Evolution.
The greatest frustration has been getting anyone to understand what I mean by “local folders”, because it’s clearly gone out of fashion and many people (yourself included) don’t use them any more.
It is playing semantics to say ‘all folders are local’, for the purpose of this conversation. of course if you download an email, it becomes local once downloaded, but that’s very counter-productive to discuss.
Look at outlook from a decade or two ago (and probably today but I wouldn’t know). In the sidebar you had “Local folders” or “On My Computer”. You have the same in MacMail. The explicit purpose of which is to ONLY be able to put mail in there yourself, they don’t “sync” to any server anyway, they’re just a dumping ground. We all understand this I think.
After many years my mac Mail Local Folders are a myriad of data carefully organised by topic and chronology. It’s a neat system which costs me no network hosting fees as they are just storage for me to refer to on one machine, which is backed up routinely of course.
I am trying to see if I can replicate my way of working from Mac Mail to Evolution. If not it will have to be Thunderbird as i KNOW that can do it, but I really don’t want to use TB unless i have no alternative.
I’d also mention that in my discussions with Evolution users on other forums/sites, I have heard things like “No I don’t think Evolution can do that as they want you to use the IMAP folders (or pop)”. Of course I am not saying that’s the case, but once I have heard it from seemingly experienced users, I am obviously dubious to start with. Moreover, when that same user tried to get local folderrs working and had to use the “Local Account:” option to make any folders appear “on my computer”, that fed into my doubts further. (Admittedly perhaps wrongly).
Finally, to hear Andre bring up the subject of “Local Accounts” in this conversation, when I have never once mentioned having any such thing, that suggested what I heard was correct in that you had to ‘use’ (hack) the Local Accounts feature to GET any local folders to exist.
That’s why i had my doubts. If I am being told that I can get local folders, many of them, nested and sub nested, without any use of the “Local accounts” feature, I am all in 
Just still not 100% certain of that yet, but willing to be convinced!
thanks