Code generally blocks a 4-inch realm from departure, which restricts the placement of the shield balusters.
https://www.scribd.com/document/972459881/What-Homeowners-in-Texas-Should-Know-About-Zoning-and-Backs-for-Boards-175789
Code commonly prevents a 4-inch realm from moving, which reduces baby trapping hazards, resulting in a code restriction on the spacing of guard balusters.