What's wrong with it? Squads look like regular small teams. Tribes look like several teams working on the same product and having to coordinate their work. Each team has specialists, who like to hang out together and talk shop, forming different "chapters". The number of product owners and agile coaches might be excessive :-) But other than that, what's so bad about it?

> The number of product owners and agile coaches might be excessive

Its a great soup, apart from the turds floating in it.