So you can save your eyes the strain of trying to read A4 pages at A5 size? Wasn’t that what the original issue was?

Stapling normal sheets from a corner doesn't have a net disadvantage when compared to booklet printing (when reading papers). Booklet allows saving paper by printing in a easily manageable format (you don't need to cut papers in half to read them properly) in a smaller form factor.

So, printing in booklet is just a convenient way to automatically downscale documents, nothing more, at least in this context.