Same reason we drop customers in SaaS , sometimes the custom ops effort is not worth the distraction and changing the software a) takes time and b) can be quite

Same reason we drop customers in SaaS , sometimes the custom ops effort is not worth the distraction and changing the software a) takes time and b) can be quite expensive and create new bugs. If the software does not support Anti-Affinity basically it is going to be someone's job to make sure it doesn't get routed to this route and manually override when it does and avoid an Aviation regulatory incident imagine the headache if Ghana refused entry or refused that plane to board passengers if by mistake it land in Accura, and the PR circus around it. The ROI on the route may not be not simply worth it. On the other hand Delta probably also do not want negative PR around scrapping the route immediately even if they wanted to. Routes rarely get scrapped overnight there are existing commercial agreements, government requirements, regulatory notices, operational change in ground support and so on to be planned and executed, even if they want to do that, it will take sometime to actually do it.