Hide structural navigation choice to power users
As structural navigation has a high negative performance impact specially in SPO publishing sites, it would make sense not to allow to switch from managed to structural navigation in the navigation settings UI. Instead the structural navigation could be activated via a powershell command only.
Renee Barnette commented
I agree with this.
If this could not be hidden, I request that Microsoft at least add a warning, along with a link for what the recommended best practices are for avoiding being throttled due to use of what is not recommended.