Do you only want us to get our news once daily via a physically printed and distributed newspaper? That’s the timeframe that we used to use for news updates. If not (I.e., you’re in favor of keeping the Internet), how would you reconcile the asymmetry between trading and news updates? If there is a disparity between these timescales, you end up with markets gapping hugely every time they open. This just increases risk and volatility. Yes, markets do this overnight today, but 24-hour markets don’t do this as much and they allow a trader to set stop orders that are active overnight to protect positions. So, for instance, futures markets will gap over a weekend break, but because they trade 23 hours per day during the week, they are much more smooth than they would otherwise be. Compare gaps in ES SPX futures contracts vs. gaps in the SPX itself, for instance. In general, smoother is better for everyone.

Humans do still manually trade. The existence of HFTs doesn't prevent or interfere with that, in fact it makes it easier by ensuring that prices are more likely to be converged to a consensus market price at any given millisecond.

Thinks of it like this. When I put in a trade at human speeds based on business fundamentals, I'm not looking that the millisecond by millisecond prices, I just put in a price I am willing to accept and if the market reaches that price I get execution. HFT makes that easier and more efficient across markets by ensuring prices are converged rapidly.

How do you think it makes it harder or worse? If I put in an order to buy at $x on a particular market because I think the stock is worth more than that for business reasons, what is it about the existence of HFT that is a problem for me?

Participating in the market certainly used to be more expensive. I'm not sure regressing to this is... A good thing?