Hi there,
Thanks for this great question!
At Google, we recommend following certain best practices for creating Web Stories. There’s also a related Web Stories content policy that covers things like not allowing text-heavy stories and low quality images and video assets that are stretched out or pixelated to the point that the viewer’s experience is negatively impacted.
If you follow this advice, your stories will be eligible to surface in places like Google Search or the stories carousel on Google Discover.
With that in mind, the checklist in the editor is our way of bringing these best practices directly to you while you are creating your stories. Just so you don’t have to learn about them after you’ve already published them. In short, it’s just some additional help.
That said, some of the checklist recommendations may be a bit more strict or different from the documentation linked to above. That’s why they are separated into different categories: Priority, Design, Accessibility.
Priority items are must haves, but some other checks can be taken more as rules of thumb. And sometimes the checks and especially their explanations are also not perfect and will be tweaked over time.
As for your two specific examples:
- It should be fine if not every page has 100 characters on it. What you should definitely avoid is too much text on a page (thus the best practice of having < 280 characters on a page).
- The two portrait photos are 200x230px in size. But in the story they’re displayed at around 239x239px. So The images are a bit too small, making them appear pixelated. Ideally use a 2x version of the images, so 500x500px so they appear more crisp.
And regarding SEO: The same SEO best practices for web pages also apply to Web Stories. A Web Story is still a web page.