A lot depends on why you use these indicators. My belief is that they best serve to clarify meaning. I welcome simplicity, and prefer Dr to Dr. and D'r (though the last has a certain whimsy). With typescript as against handwriting, spaces can take the place of dots eg J M Barrie not J.M.Barrie, because the relatively fixed space is readily seen.

When we decided to use open punctuation I was not happy; now I find that all the extra points and commas look cluttered and amateur.

I much prefer to think of these matters as conventions rather than rules. I would only wish for consistent usage within a document. My own guide is 'Rules of Printed English@ by Herbert Rees, a book which I find logical and helpful.

Stu