I’m not a huge fan of heights, and Zendikar seems to have a lot of high places that would be easy to fall from. Also, a notable lack of guardrails.
We’d like to welcome our newest member of the No Guardrails Club. This is Kaladesh. That yellow thing is obviously ornamental, and it’s tiny. Clearly not protecting anyone. In the No Guardrails Club, we expect solid, functional guardrails.