Sadly, this feels exactly like what working in big tech has been like for me. It amazes me that after so many years of these types of problems that in 2023 a team can have a bus factor of 1 across the entire team, with requirements often being one sentence in a Slack message or a Jira ticket with zero context that says "do this".

Making a decision, but not explaining the rational behind the decision. Just saying 'that's it, we are doing this!'.