I've never had my first set of leaves turn yellow... Maybe you grow shwag ?
Its the stored energy of the seed, that energy deteriorates with seed age and if a seed germinates from a greater depth below the soil it will burn more stored nutrients.
The first leaves represent the stored energy in the seed from the mother plant that produced the seed.. and the mother plants health at the time.
Those first 2 leaves are the 2 halves of the seed itself
yellow embryonic leaves are a common sign and occurrence and perfectly healthy, those first leaves abort anyway once the plant has used there total carbohydrates, that is their purpose. .
The new leaves show the current health of a plant and the older leaves represent its history.
Do I grow Shwag? well those are my plants in my avatar, given Horticulture is my profession of 25 years, and I consult for over 100 growers in the industry, ill let you make your own mind up on that.