Depending on what your code is doing, even if there are good endian-agnostic abstractions, endianness bugs are still likely to slip in from time to time unless

Depending on what your code is doing, even if there are good endian-agnostic abstractions, endianness bugs are still likely to slip in from time to time unless you're defending against them by having your CI run on a big-endian platform. QEMU does this, and although CI-fails-on-BE is rare, it happens often enough that I wouldn't want to lose the coverage. (On the theme of the original article, IBM actively support this by giving us CI resource via the IBM LinuxONE Community Cloud machines, as well as being active in upstream development.)