Wikipedia’s due weight principle aims to ensure that topics and viewpoints are covered in proportion to the attention they’ve received in reliable, independent sources. This doesn’t mean every detail gets equal space—coverage should reflect how much a topic matters in the broader public record.
For example, if a company controversy has been widely reported in major news outlets, it will likely be discussed in the article, even if the company considers it minor. On the other hand, positive company news that hasn’t received much third-party coverage likely won't be accepted in the article.
Undue weight occurs when an article gives excessive attention to fringe ideas, marginal perspectives, or isolated incidents that lack support in reputable sources. Wikipedia aims to present a balanced summary of what's been published. It does not want to be a battleground over ideas, reputations, or grievances.
