Yes, but it can be useful for servers who don’t provide EWS
I doubt there would be enough major company servers around left to warrant eM Client putting support in the desktop app for EAS and most newer desktop mail clients have also now moved to EWS too.
Eg - Quote from Microsoft site - “As a result of performance issues, Microsoft discontinued support for Exchange ActiveSync (EAS) in Outlook 2016 and only now supports mobile with EAS. You’ll will still be able to use EAS connections in any of your other Mail apps such as on your smartphone or tablet devices”.
As @Gary says EAS is mainly now only supported on Mobile clients due to the device protocol. So if eM Client was going to support that they may possibly do EAS in an upcoming mobile app as well as EWS. Who knows.Time will tell if that eventuates.
If you like the idea of an eM Client mobile app add a favourite to the top of the above thread link and post a comment as well if you like.