This is a lot of companies, but this is not every company. Yes, they probably can't get into specifics with avoid harming worker privacy, but if they have to spend their time obfuscating their culture, I probably don't want to work with them.

At this point in my career, as I'm looking for senior roles in internal development, I'm interviewing the company as much as they're interviewing me. If I have to take over major development projects and architecting, I need to know what I'm walking into. If they aren't comfortable answering questions, I don't need to work there.

Recently I interviewed for a senior position at a development company, and their CTO seemed miffed by fairly straight forward questions about their history and practices. I didn't get a third interview, but I also see they've now made a posting for that same job a 3rd time, so it doesn't seem like that strategy is working out for them. If you want senior developers to lead, you have to be honest with them about what they're leading.