You asked, so allow me to add this picture.

BLUE is uneven poly distribution.
Or too big poly size variations. From very large to very small very soon...

RED is too many poly's for the particular area.

I agree, outsides like the outside al an elbow need an extra poly line more then the inside of an elbow.
Same for a kneebend.
Outsides strech when bending, insides shrink when bending.

But only area's that are in these bending area's need an extra poly line.

On the chest between the breasts: or the navel, or the ears? That is common.
Most figures meshes turn BLACK from poly's when looked at from a distance.
When you see that, it's time for a clean up.

Area's that turn BLACK when you look at a mesh from a distance need a clean-up.
Except where those poly's are required, like on the face, or nipples.

Just my humble opinion.

Even Poly distribution is THE single most difficult part of building a figure.
Thanks for reading.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!