2.3.5 moviestacking / exactly four / crazy requirment to be removed

I was just browsing above kodi section as result of discussion elsewhere in this forum. When reading about regexp also in this context, i stumbled into some requirements / documentation that appears so crazy its almost North Korean.
1) apparently, movie stacking should have exactly FOUR regexps. Why on earth can there be only FOUR? We are not running on a 16KB ZX Spectrum anymore
2) given there should be four, why on earth does the example / default list only THREE?

Cmon guys, we cant leave this as crazy as is. North Korea even would do better….

Sent from my iPhone (typie typie)