From what I heard, you can only SPAWN with 1. AR/BR/DMR/Storm Rifle/Carbine and 1. Magnum/Plasma Pistol. However you can pick up any weapon in gameplay like normal without the stupid limitation.
I hated the idea of Primary & Secondary weapons in Halo, but if it’s for spawn only and it prevents people from spawning with a Battle Rifle+DMR combo and dominating than I’m fine with it.