Hi Mikael Svenson ,
Thank you for your reply to my comment.
It makes perfectly sense what you said about Microsoft Search and I'm fully aware about it. But, is not yet there in terms of end-user experience customizations.
Just focusing on SharePoint Search, I would say that the concept of a modern search center with multiple full layout search pages is interchangeable with a search based portal or content roll up portal, you mentioned. For me is the same thing, just that you need more real estate which is provided by by the search page layout.
Plus, that nobody wants build a rollup search portal with one single page. For a more complex scenario, one page is not enough.
Until, the new out of the box verticals, plus the adaptive cards for templating will be available, the current possibilities of of customizing the out of the box experience of the SharePoint search application page are pretty limited, I would say.
I won't go for hiding the OOB Search Box or any other type of customizations for the Office bar, if these are not offered by Microsoft.
For the scenario, you could have multiple sets of verticals, each set focusing on a specific type of content (e.g. Digital Media set with the following verticals: All Images, ClipArt's, Black and White,..., and then Pages set with verticals like: News, Procedures, Blogs, etc.).
I know, you could say that these should be part of refiners, which is valid for a simple scenario, but for a complex scenario, you have specific refiners for each set of verticals and the business wants each set of verticals on a separate page..
Catalin