While convenient as a std::array, it's also quite a large set of data as well (32KB). It being an array also means data cannot be std::moved. Any situation where the code is being set or relocated means that a full copy of that 32KB data must be done. If we use a std::vector we do need to allocate on the heap, however, it does allow us to std::move the data we have within the std::vector into another std::vector instance, eliminating the need to always copy the program data (as std::move in this case would just transfer the pointers and bare necessities over to the new vector instance).