I think prioritizing and focusing on the right thing is one of the skills senior developers have. You don't normally have one isolated problem to solve. You hav

I think prioritizing and focusing on the right thing is one of the skills senior developers have. You don't normally have one isolated problem to solve. You have a problem and it branches out into multiple other problems. Over time you just learn to estimate the importance and the time you can spend on each problem to get things going. So you do have to have a deep understanding of the important part, but you cannot go into too much detail for every single sub-problem you have, otherwise the productivity will be very low.