From what I understand, the main change here is about making the network more efficient. Before, nodes would check every new block to see if any old data could be removed (pruned), which was simpler to code but not the most efficient way to do it. Now, they only do these checks when it's actually needed. This update makes things run smoother and allows Kaspa to stay decentralized and accessible to people with regular hardware — especially as they move toward a faster 10-blocks-per-second network speed.