I'm a bit biased because my home state is Ohio and they have it in their constitution that the state can't have a stake in any private company and can't even lend credit to any private company. And this amendment was written in blood, in the early 19th century the state nearly bankrupted itself investing in and taking stake in private companies.
* The state can't risk taxpayer money on ventures that might not pay off or lose them
money. How the state "gets around this" is by issuing zero recourse loans. The advantage is that when economic development money is handed out there's not an asset on the balance sheet. It's treated like it was spent. The value the state gets from spending the money has to be independently worth it for taxpayer without considering financial returns.
* It eliminates a whole category of conflicts of interests where the government will get squeamish regulating or punishing bad behavior because it would hurt the taxpayers' investment.
* It also eliminates vectors for corruption as well as the negative effects of the government having direct influence over specific businesses. No backdoor regulations from the state's ownership stake that don't go through the legislature.
So I'm very heavily in the camp that government shouldn't ever be allowed to have stake in any private company. The line between government and private enterprise should be the wall this admin likes to talk about. I certainly didn't expect it would be republicans I would be trying to convince that state ownership of business is a bad thing.