Usually, I get very excited about the new features that Microsoft announces, and try to be part of the first users to test them, but this time, I am very disappointed.
This is not really a new layout, it has been arround for a while, and I have really tried to get familiar with it without success.
Most of the features that were accessible with two clicks, have now been hidden and it make me very stressed to navigate through this layout.
Thankfully, there is stil lthe possibility to roll back to the old lovely layout
I am sure, this will be turned off at certain point, unless Microsoft hears what the admins and developers are reporting, and believe me, I am not the only one complaining.
Probably a re-design using the new SPFx and keeping the previous navigation and layout would have a better acceptance and positive feedback.