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I'd actually be curious if there's any reason most tailors don't do single piece backs.
My understanding: if you need to do certain alterations in the future, you may be limited by the fact that there's no center back seam. For example, if you gain weight, an alterations tailor might let out the back seam. But now there's no back seam, the tailor will have to adjust the garment using side seams.
A center back seam can also allow you to get more shaping in the back. This may be useful if you have a very athletic build.