Currently, with introduced Responsive toolbar it's worth to consider a "full feature" sample.
At this moment discoverability of editor features is really poor. We don't' have any demo/page with listed features of CKEditor 5, even on our website. The new user is only able to scroll the Features menu on documentation page or check Features section in our README.
It would be much easier to include every single feature in one demo and give users a possibility to "play" with them instead of checking a single dedicated sample/page.
Note: It might be a blocker: https://github.com/ckeditor/ckeditor5/issues/5586.
cc @Reinmar @mlewand @oleq @AnnaTomanek
Builds named as Full features build with provided source code?It would be nice to present a demo with a lot of features. We will need help from the marketing team for sure. cc @PiotrMaciej

What is more important to show at first? Table or font color? Undo/redo or MediaEmbed? It's a question to you guys, do you have any ideas about improving the order of toolbar items?

I'm having second doubts here. We've been here in the past – with editors that support everything. It kinda works because it seems that the editor can do everything. But somehow, with time, starting from CKEditor 4.0, we moved in the other direction.
Why?
But, at the same time, I completely agree that we have discoverability issues. I'd look for alternative options:
WDYT?
We could have a mega-build with all the most common/usable features. Not necessarily on features' landing page, but referenced there - should do. As this is virtually impossible to put all the features in it, we could try coming up with more than one - like cooperation oriented (comments and track changes), simplicity oriented (autoformatting etc.).
Also: doesn't onlinehtmleditor kinda serve this very purpose? It should be updated with the newest features, sure, but this is a good start.
I'm not sure about
Making it clear in all examples, that the showcased editor doesn't contain all features
Putting a piece of information in each guide about it? The very idea is cool, but I can't really picture the execution. We could easily put it on the main features page once this gets a makeover, but people often bypass it, coming for specific features.
Also: do we have an in-editor help button? Or context help?
Most helpful comment
I'm having second doubts here. We've been here in the past – with editors that support everything. It kinda works because it seems that the editor can do everything. But somehow, with time, starting from CKEditor 4.0, we moved in the other direction.
Why?
But, at the same time, I completely agree that we have discoverability issues. I'd look for alternative options:
WDYT?