芝加哥公牛队标志之所以没有换，可能是因为它已经成为了球队的象征和品牌标志。
这个标志代表着公牛队的历史、荣誉和传统，并且被球迷们深深喜爱和认同。
换掉标志可能会导致球队失去独特的形象，甚至引起球迷的反对和不满。
此外，标志的更新可能需要耗费大量的时间、精力和金钱，而球队可能更愿意将这些资源投入到球队的训练、战术和球员招募上。
所以，即使有人提出更换标志的建议，芝加哥公牛队可能会认为保持现有的标志更有利于球队的发展和形象维护。
Overall, the decision to keep the Chicago Bulls logo unchanged could be attributed to its significance as a symbol of the team's history, honor, and tradition. The logo has become deeply cherished and identified by fans. Replacing it could risk losing the unique image of the team and potentially face backlash from supporters. Additionally, updating the logo would require considerable time, effort, and resources, which the team might prefer to invest in training, tactics, and player recruitment. Therefore, even with suggestions for a logo change, the Chicago Bulls may believe that maintaining the current logo is more advantageous for the team's development and image preservation.