Three needle bind off in moss rib stitch

Is it necessary to do a three needle bind-off in moss rib stitch for shoulder seams on a sweater to maintain the stitch gauge?

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Not to maintain gauge, no. Three needle bind off is such a nice sturdy bind off to use. You can maintain pattern or bind off in knit or purl sts if you wish.
Try it on a small swatch to see if you like the look of the bind off as say, all knits.

Thanks. I’ll give it a try. Yes, I like how sturdy 3NBO is too, especially with the heavier yearns.