You know there’s the yellow one for a reason lmao primary main is the one you automatically go to if everything else is filled in (I main Mercy and will automatically pick her if there’s not already a healer)
Secondary mains are your “flex” mains.
You’re not someone who flexes cuz you’re not willing to pick anything if someone asks you to. For example, Torb and Bastion can both be utilized pretty well if they are used properly on the right maps but you’re just sayin “hah nope” if someone asks you to pick one of them.