Zig-zag is on most of the 'home' European machines I've found from the mid-50s/1960 onward. Examples:Bernina 125:1945, Elna:1952, Pfaff260:1960...not counting the Pfaff 130, which had ZZ in the 1930s..
One of the big attractions of the zig-zag machines was that buttonholes didn't require a separate attachment, though many sewers (before the digital/electronic era machines) prefer the BH attachments as it's easier to get consistent sizes and alternate (keyhole) shapes are possible as well. Once the zig-zag (side movement) technology was in the machine, the craze for decorative stitches took off.
I like using zigzag in some gear making - there's a reason that practically all the stitching on a sailboat sail is zig-zag, not straight: better performance under strain. And bar tacks are nice sometimes as well.
But...not necessary.....
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