I'd agree, but this is even more subtle, as a sibling comment to yours said: the space is actually smaller. So text rendering should take this rule into account

I'd agree, but this is even more subtle, as a sibling comment to yours said: the space is actually smaller. So text rendering should take this rule into account as well. But then you're assuming that you're doing single-language text rendering. Putting the character at writing time still seems like a simpler tradeoff (maybe with editing help like auto-replace or correction).