Although the in-out line is a line that suits most Asians more than the outline,
these days, I think that the in-out line is an ambiguous line that makes it difficult to symmetrically match double eyelids if the original shape or size of the eyes are very different.
For example, if the line is small, The front line is buried in the front of the eye, so it looks like an inline, and
when it gets bigger, it's not an outline, but the front is vaguely blocked? It's an awkward line that looks like an outline and can cause a lot of mismatching..
I'll do an inline because even if the eye sizes are different on both sides, it won't be noticeable because it's an inner pair, and an outline is a line that is away from the eyes, so it looks relatively less mismatched. These days, I think it's better to have a semi-outline or just a large outline, but I'm curious what other people think.