Hi Bruno. Broadly speaking our dev priorities fall into (a) improving existing features and (b) adding new ones. You can get a rough idea of our roadmap by looking at the features mentioned in this post.
We prioritise features based on how useful we think they would be for everyone and how hard they are to implement. For example, ‘undo’ would be really useful for everyone but also not simple to implement, which is the only reason it hasn’t happened yet.
A big part of understanding how useful features would be is feedback from the community, which is why we have feature requests in this forum and also periodically survey users about what they see as the priorities.
Hope that helps!