Expecting 1 person to make 100% correct decisions all the time is too much expectation for one person. People go down rabbit holes and they have weird takeaways, like replace all the databases with queues.
In this particular company, the Chief Architect in theory had a group around him. They did nothing to check his poor decisions, and from the outside seemed primarily interested in living in the functional programming nirvana he promised them.
I have, however, always wondered why people should be seen as "only architects" and "only engineers". While the separation of duties is critical to ensure the overall construction is sound, people can be visionary engineers, and people can be knowledgeable in both how to do something in real terms as well as dreaming on how to go beyond.