We often talk about the part of the design that's considered last. Nobody wants to have their subsystem as the final thought. That often requires shoehorning the subsection into an area that's not appropriate.
The parts that come up most often in the last-to-be-considered category include the battery or power subsystem, the cooling method, and the circuit protection. Nothing should be last (but something has to be), so I suggest you take extra caution if circuit protection falls to the bottom.
One excuse is that it's easy to design, so you should leave it to the end. Another is that it's a very small component, so extra care isn't really required. Whatever your excuse is, it's time to end the excuses.
We have created a Technology Roundup that answers a lot of the questions you may have about circuit protection.