I use Adobe express pages to create linktrees and also temporary portfolios (link sharing), but I think usage could be greatly improved with some integrations. One that could be interesting is one with Genial.ly (Behance and portfolio already accept genially integrations) so we could use the pages with some animations, interactive elements etc...
But basically anything would be potentially interesting. I'm thinking issuu, google maps, medium, vimeo, youtube... you name it.
Think of all the "mini-sites" local businesses and non-profits could put together in seconds for temporary events (including fundraisers, exhibitions etc...). All the customers for whom Adobe express is the tool of choice.