Thanks for taking the time to share your feedback with us, @Jens_Handierk! We already have a thread on this topic so I’ve gone ahead and merged your post with Ability to see Dependencies on mobile to consolidate feedback.
As it stands, it’s currently not possible to see if a task is blocked by another task on mobile. I’ve gone ahead and escalated this to our product team and hopefully we can implement it in the near future. I’ll keep you posted as soon as I have any news.
In regards to Tags, I recommend you upvoting for this feature here: Show Tags on Mobile. We don’t have immediate plans to implement this option but I will also share it with our product team so they can consider it in future updates!