App concept

I think a lot about the ideal self time-management and what is missing in trackers and logging apps. Some are too complicated, others don't have enough functionality. As a reasoning on the topic appeared this concept.

Perfect app, For me, must have a countdown and the opportunity not to waste time on the transition between the tasks. So, according to my idea, when you take a new task during the unfinished previous one, the unfinished automatically pauses.