Angles certainly can make a difference. But concrete geometric lengths and values would better "describe" the player to court ratio because numbers are factual and numbers don't lie.
Why would measuring players' real heights, limb length, girth, shoe size in relation to the court not be more accurate? Someone who is 6 feet tall is going to remain 6 feet tall regardless of camera angle. Camera angle may cloud our judgment because optical illusion may be at play. But 6 feet is 6 feet regardless of camera angle.
Mathematical measures supercedes all optical illusions.
"An NBA game court is 94 feet long and 50 feet wide, divided in half by a midcourt line. Each half is a mirror image of the other. This diagram shows some of the key markings and areas of an NBA basketball court. - google internet search"
Jameer Nelson is 6' feet tall. An NBA basketball court is 50 feet wide. Mathematical measurements says we should be able to fit #8.33 Jameer Nelson across the width of the floor.
An architect uses numbers to draw up plans. They don't use "optical illusion" / "different angles looking at things to determine proper dimensions." Everything is based on numbers because numbers are concrete hard evidence.
Stride length could certainly factor into play, but that is only part of it. I think the most important component still comes down to player's size to court ratio. If we have 10 guys on the court and they don't move, stride length no longer can determine if the player to court ratio is proper or not.