What is the point of a portfolio site? It's for you to convince people that you can do the job they're looking for.
Does making your portfolio site gorgeous to the last detail help achieve that goal? Not really -- these days anyone can download a template and make their site look great.
What's the best way to achieve that goal? By telling clear, engaging stories about the work you've done in your career, and the impact it had.
For Jr to Mid-level designers, this is an absolute must to have on your portfolio site.
As you progress through your career, something interesting happens: For Sr. designers and Sr. leadership, case studies can be overkill in the early stages. If you've worked at well-known companies on well-known products, that should be enough to convince people that you can do that job, and all you need is a deck to pass through the later hiring stages. You still need to tell clear, engaging stories about the work you've done and the impact it had, but it becomes less necessary to do so at an earlier stage in the process.
However, your actual portfolio site can be a Google Doc with screenshots if you have great stories to tell. Trust me, a hiring manager will not care and possibly even prefer the google doc over a website that isn't easy to follow.
The specific platform you use to talk about your work doesn't matter. The work is what matters. Honor the work.