That just addresses periods, and not question marks and exclamation marks. Anyway, rationale does not pose a challenge for software. Software simply needs to differentiate between periods that are followed by a space and a lower case letter and a period that is followed by a space and an upper case letter. The possible occurrances of a period ending an acronym followed by a space and a capital mid-sentence are very few indeed. That is not sufficient rationale to change the English language.