Why did ASX tech shares like Afterpay (ASX:APT) have such a good day?

ASX tech shares had a very solid day today. The S&P/ASX All Technology Index (ASX: XTX) ended up rising 1.26% to 2,668.1 points. That looks pretty decent against the broader S&P/ASX 200 Index (ASX: XJO), which actually fell 0.32% to 7,092.5 points.

But…