We'll agree to disagree on that mate! LOL
I've done a fair number of Windows apps and saving the window loc/size was always a given.
Discounting my own experience, Eclipse, Visual Code, Visual Studio, hell even Notepad++ manages it - and every one of those is using standard Windows chrome (I can be certain of this because I've built a visual style that changes the default min/max/close buttons not to mention the rest of the appearance of the standard Windows "window" - so if those apps weren't using the standard, it would be pretty obvious).
In any case - it's not an issue. Merely a suggestion!