If you're considering these splices, factor in the extra time to cut them. I am sure sourcing long timber would be a time and cost savings as well as a more sound structure. Any splice is not as strong as a splice. I could see splicing a couple or fixing for repair. To install all splices is going overboard. You can cut all the other joints on the post in the time it takes to make the two halfs of the splice, fit them and have them come out nicely. If you client has cost restraints you will we working for no return.