On the contrary, it is extremely relevant.
Case in point: persons of east Asian decent. Though many appear to have fair skin colors, their skin differs from that of northern Europeans in structure and physiology, namely in that it is more compact with many more layers of cells. Thus, they can have underlying pigment and have a higher propensity for hyperpigmentation and burning after laser exposure - even though they may appear to be light in skin color.
However, the same anatomical and physiological differences also allow them to develop tans more readily. Since Fitzpatrick skin type is a function of both skin color AND response to UV light, they technically are usually types IV and higher, even though their skin color appears light.
That is why you can’t just look at your skin color to determine your Fitzpatrick type, even though you can get a general idea.
In your previous post, you stated that your Fitzpatrick skin type “changed” after sun exposure. Essentially, all I was pointing out was that your actual skin type assignment remains static, because it is a function of TWO parameters.
Not sure what you mean by “it.”
Yes, obviously, tanning contraindicates laser hair removal, or, at a minimum, requires lower fluences.
However, that you had laser treatments on your tanned legs without adverse effects does not imply that someone naturally as dark could do the same.