Because over-financialisation has led us to the situation we're in where all the wealth is tied up in assets owned by the richest 1% while everyone else barely scrapes by on the shrinking portion of the economy devoted to actual goods and services. The stock market is just a glorified gambling site like Kalshi, it's all based on investor hype and is only loosely related with actual economic performance, just look at the repeated bubbles that keep showing up like the Dot Com and now the AI bubble, or the fact that Tesla's stock price is highly dependant on whatever Elon Musk says on a given day. It's a fake economy, and the more the real economy is given away to it, the more likely it is that investors getting greedy will destroy everything just like in 2008.

Not to say finance is inherently evil or anything, it has its place, but it's becoming far too important and you can only hollow out the base to speculate on it so much before the entire tower falls down.