Cursive helps with fine motor control. Chess helps you with memorization. Using an abacus might help with both.
That’s not the point. The point is kids have a limited time. I don’t want my kids to learn cursive or the abacus because that will take time off from stuff that’s almost surely more relevant. Perhaps I’m wrong and learning with an abacus is the best use of their time.
I hated cursive with a passion and some of my teachers forced me to use it at different points of my primary education. It was falling out of fashion then and only the hardcore old-timers thought it should be forced upon children. I wrote a perfectly legible print, but for them I just HAD to do it their way