Unless you’re telling me that all systems (including this one) regularly insert an em-space after a period that ends a sentence (as opposed to other lists of period-based punctuation marks), I will have to disagree. And since an em-space is two standard spaces, my point stands.
I mean, they mostly don't but typography is broadly terrible? And an em space is the width of an M while an en space is the width of an N, so it's not 2:1 and in fact varies by font. Monospace fonts (like Courier New) still benefit from the two spaces if you're just going for a nostalgic look.
This seems important to you so keep doing you, but it's not typographically "correct", just an idiosyncratic personal preference, which is cool and fine.