I really enjoy working with most of Editor X, but one aspect is so poorly implemented I feel it needs flagging up again for improvement, and that's Pages management.
Take a look at my 1st screenshot from my current site, which shows how things are through the Site Pages sidebar:
- the sidebar is fixed width, meaning that although you can give a page a meaningful name, you can never actually view that name in full...unless of course you guess / scroll to the page to hover directly over it. (BTW please don't criticise my long page names; they're overly-long in a lot of cases precisely because there's no adequate way to organise, manage & group pages properly in EdX)
- following on, there's no way to sort or group pages. Nothing like custom groups, custom sorting, active / inactive groups etc. The whole sidebar is 'frozen', making it an absolute nightmare to locate & work with a page quickly.
- the workaround of a search box is fine, but should only ever be an option, not a workaround. I need to see my full page names & also be able organise my pages properly, how I want, without having to fall back on searching or scrolling.
- planning & organising a site in EdX becomes almost impossible for the previous reasons too.

The 2nd screenshot shows the editor drop-down pages list which is just as inadequate as the pages sidebar. It also has a fixed width display with no other configuration / view options available...and again I'm only able to properly view a page name to select a page after scrolling down then guessing which page to hover over...not good!

It's easy to see from this that anything other than just small sites, with not many pages, can quickly become very frustrating & difficult to work with in terms of page navigation.
The performance in this area really lets down what is a great product, which I find otherwise to be a joy to use each day.
Without overstating it I think, pages management in EdX is dreadful, a nightmare to use each day...and since this is such a fundamental aspect of EdX, in use ALL the time, these shortcomings badly affect productivity, so we really do need to see some improvements here fast.
So, come on EdX