Themes

We have to keep in mind as time goes on they'll add more features. Maybe more color themes is one of those features or a fix in compatibility to allow the Chrome themes to also work. Edge C is only in beta right now and not even in Stable. I'm sure they have a list of features to add and test out first (some important to keep the browser running stable) or keep testing out the features already in place to make sure they remain stable. Even once Edge hits Stable they can add new features through the channel chain (starting in Canary and working it's way up to Stable) like Chrome does with their browser.

I tried the Chrome color extension theme on Edge (Canary) when Edge first hit beta to see how it would look, and it didn't work. The message coming from the Chrome store was something about it not being compatible with Edge version. It's one of the few areas of the Chrome Store that's not able to cross over.  I don't know if it has to do with the user interface of Edge not matching up to the coding of the Chrome extension themes, or if Chrome blocked it. 

At a later point in time it would be interesting to see Edge add their own compatible themes or other color options Like Firefox did with their browser. Google Chrome has added an experiment flag to their Canary that if click to "dark" it makes all web pages dark theme (without having to use any theme extension) including the web pages themselves (not just the browser) so Chrome is going in the direction of Edge with that. 

I'm happy with the simple light/dark/default theme as I pretty much just use the light theme and occasionally switch to the dark theme, but I'm aware many Chrome crossover users might want more color themes. See what happens I guess.

This is the Google Chrome Canary flag they added of the dark/light option without having to use a theme extension: