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Todays PT does not rot easily as long as there's no earth to wood contact. It's not as good as it was back in the day when it was super dark green. They advertized to last 40 years buried in a tropical jungle. It was deemed too carcinogenic and I'm sure they were right. Cheap redwood from a big box store is not worth using in my opinion. Cut from 8 year old farmed trees and not much better outdoors than fir or pine. The "white" grain you refer to is called sap wood and rots faster than interior soft woods. You can still get old growth, real deal redwood but you'll pay dearly for it. For framing outdoors I go with PT and dont let it touch the ground or bury it in concrete
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