Ok, back to the saddle being in the wrong place, a real pain in the butt from a dysfunctional system (e.g. poor bike fit). It then becomes a game of tolerance with time. Let's start with a given hip angle and add the compression of muscles due to the anterior rotation of the pelvis on nerves (e.g. piriformis), it can become a major issue for sports that require excessive use of the gluteal muscles. So what position is it? Is there a position v. motion?
Start with women who are more likely to develop the sciatic syndrome, hypertrophy may be the cause. In about 12% of people the sciatic nerve passes through the piriformis. It can pass over, through or under or in any combination.
Think about what that means in finding the correct lordosis with a saddle. Way too often, the saddle is placed too far forward, level or for what ever reason a fitter comes up with, because of ease of using the plumb-line to knee, this lowers the saddle, it puts the lumbosacral angle in the wrong zone, much more compression is placed on the distal spine, plus more press on the rearward ischial ramus, there is a bursa and it can have microtrauma, resulting in bursitis (e.g. inflammation) or even calcification in the bursa that is chronic. It causes you to also deepen the knee flexion at the top of the pedal stroke, an area of concern.
Plumb-line is easy, fast, low-tech, very general, plus cause compression of the piriformis, micro trauma, hypertrophy of certain muscles, IT band issues, chronic bursitis, even calcification, along with sciatic. Yet it is used as the reference point for most of the bike fits people pay for. Another method is to place angle device on the lateral aspect and eyeball it, again "no cigar".
Sciatica can be caused by a herniated disc or bone deposited, that narrows the foramina, but also for other reasons. Any maneuver that stretches the sciatic nerve, poor skills (e.g. heel down pedal style), flexing the thigh wrongly with leg extended, having the saddle in the wrong location, wrong saddle choice, etc...
People should realize when you move the saddle too much forward they place more compression, more stretch to area around the hip, more pressures on things that can take you out of the game (e.g. a real pain in the butt), things that can produce or exacerbate pain. On the other side, having the saddle too much the other direction is not much better.
There are many parts of a hip, ilium, sacrum, anterior and posterior aspects, ramus of ischium, ischial tuberosity, inferior rams of pubis and a bony pubis, nerves and bursa sacs. They all need to be able to move in & out of balance upon a saddle. There are even deeper groups of muscles of concern (piriformis, obturator interns, externus gemelli, and quadrates femurs), all covered by the inferior half of the gluteus maximus, and the lateral rotators of the thigh. All these move a lot and work together to help stabilize the hip joint by steadying the femoral head in the acetabulum. So tracking superficial muscles makes it next to impossible to wants going on deeper where compression, shearing, and tension occur.
"You don't want to sit on your gluteus maximus"
Then you have to concern everything above it in space, the best shoulder blades, spine motions, etc... Then you have different angles of inclination of the long axis of the femoral neck that varies with age, sex, and the development of the femur.
Just like the ski industry, for years retail shops just sold ski boots that had sizzle, but few really knew what the foot really needed. They didn't care to track the movement of the bones ( 7 tarsal, 5 metatarsal & 14 phalanges) of the feet that lie inside of a given shoe? That was too hard, and besides they would never know the difference. So that's the question, who cares?
How long is it going to take to get people to care? It would seem a lot don't care, as they just park their bikes and allow it to collect dust due to the thing being a pain!
Any wonder we can't get more people on bikes, it takes much effort to teach, after all it's a pain in the butt to go through the whole process, besides "it's a pain in their butt, not the fitter." You can simply have someone use a plumb-line and call it good, sit on things that really hurt, who cares. It would seem the industry doesn't care! That means the guy who thinks they aren't part of the industry. Proof is in the fact that it is used everywhere. But again, it's easy and they will never know the difference!