@Aklapper to follow up on conversation at Lyon Hackathon with @Bmueller: WMDE folks explained at Tech on Tour (real life meetings with the community) the process of software development, why engineering tasks sometimes take longer and how prioritisation works.
After that, think how to potentially express this in Phab (expanding https://www.mediawiki.org/wiki/Phabricator/Project_management#Setting_task_priorities and also adding a comment when prioritizing linking to that page?)
Also the aspect that interaction in Phabricator could sometimes feel more friendly / welcoming (e.g. the good and bad idea to mark new users as such, see T64324: Visually indicate when a Phabricator user is new (Welcome culture)).