I could see if you were making a lot of content, but for a single bathroom I can’t imagine that being more than a few minutes aligning the UVs and tiling of a few surfaces. back in the day we used to be very careful about lining up brick textures on BSP and it can indeed be a pain when doing a larger level, but for small rooms its no big deal.
You could always chamfer the corners and make a decal like grout texture but it will be just as much work if not more.