you are mixing 2 unrelated topics: color depth of your textures and proper use of color spaces (or gamma). Linear workflow covers just the second issue. If using correct LWF( max 2014+ properly set up to use gamma 2.2), you are fine. Only problem you could get from using only 8bit textures is banding. No "incorrect result", "worse image", "less information", "less color", "lost luma", or anything like that