Ecency made a new Update some time ago. One word to say : Great.
Most of the little problem are really disappearing at each new update and all the big ones that I told you at my first post about the app are already gone since a long time.
Now using the app is really smooth and easy !
First of all, the tags and buttons are now shown properly and it makes them less noticeable, which is a great thing, you can now put all your attention on the users' content !
The problem about image ration is also gone !
Indeed the team changed the format of the thumbnail to be able to adapt himself with the first image of the post's format.
You can clearly see it on this 
Some of the pictures are still cropped but it's when they have a particularly unusual ratio. Often when they are too high.
The app is also much faster that it used to be. Switching from an account to an other isn't causing any problem. I don't have to restart the app anymore (it happens sometimes but My phone is in cause).
You don't have to wait two secondes between two clicks and that's really appreciated !