I think you can have a separation between days while still allowing 24/7 trading. Just schedule automatic operations like stock splits at midnight, and with a proper staging environment you can deploy software in the middle of the day, too (just give a heads-up first).

And of course, overnight trading is available on some stock exchanges now. (I’m not sure whether this is a new thing or has existed for a while, but I’ve only noticed it on TradingView for some papers about a year ago I think.)