I have been working with Portals every day since Microsoft bought Adxstudio in 2015. As the lead front-end developer, designer, architect and product adviser in portal projects the last two years I have learned with the product as it grew up.
The last update for Portals is the PowerApps Portals interface; making it more accessible to non-code users and customizes, is a major milestone. With this missing piece in place we are ready for the world.
What I love the most about working with Portals is that I get to work with so many different aspects of the web; setting up authentication trough AzureB2C, theming using Bootstrap and SCSS, building structure using HTML5, improving user experience with liquid and jQuery and still making out of the box features shine.
The response and cooperation of Microsoft support show a real dedication and investment in the product. If you were wondering, portals are here to stay, and so am I.