vertical cracks in posts and newels as shown can be ignored, they are just drying fissures and do not effect the strength.
If it is treated timber, rather than naturally durable timber, then the crack may expose untreated timber. this does not matter on a vertical piece to much, as the water is not retained in the crack.
Small surface fissures on deck boards in most cases do no harm, but larger ones will expose untreated timber, and it will be held in the crack, if the timber is naturally durable, then they can be safely ignored.
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