Why are we not allowed to have overlapping bonuses in the following local deployment scenario?

- Territory is part of a positive income bonus
- Territory is also part of a negative income bonus

https://www.warzone.com/wiki/Local_deployments says that "you must override one of each overlapping bonuses to 0 or negative, so that no territories belong to multiple positive bonuses" and that makes sense, since negative penalties are spread evenly throughout. However, trying to create a game with overlapping negative bonuses is not allowed.

because you can't have overlapping bonuses in LD

You can't have overlapping positive bonuses, but why not negative? As global penalties, they don't conflict with the game logic, and the wiki implies (unless it's totally incorrect) that it was possible at one point.

cause the elite don't like LD siege and want to undermine anything similar to it

You can't have overlapping positive bonuses, but why not negative? As global penalties, they don't conflict with the game logic, and the wiki implies (unless it's totally incorrect) that it was possible at one point.
Lazy programming. There is nothing wrong with overlapping bonuses on LD, excluding possibly bumfuzzelling UI (order of deployment could matter in some weird maps). Though we already have LD commerce with an army cost multiplier, which is very discombobulating.