Using these utility lands as part of your game plan gives your ramp deck more staying power and flexibility
If you cast a creature spell this way, it gains haste until you lose control of that creature (or, in rare cases, you lose control of the creature spell while it's on the stack)
Old Gnawbone, Kokusho, the Evening Star, and Galazeth Prismari are examples of commanders that happen to be dragons but arent great dragon commanders since they have no inherent synergy with other dragons
which are all areas of whites expertise in the color pie
Most importantly, a lot of this rally has been driven by supply chain issues
The promise of some extra mana can absolutely make your opponents start pinging each other, making them the very group slug resources you need