There are probably a number of reasons. My opinion is that Access is, after all, a tool for the creation of relational database applications, and as such Microsoft always has, and always will, place greater priority on features that improve managing data than on features for displaying it.
Another possible reason is that many developers have not been particularly concerned about it and have not made it a priority request because it is so easy to automate Excel to handle that display function while managing their data in their Access relational database applications.
Beyond that, there are other considerations too. For example, starting in the last couple of versions, Access has begun to incorporate features of modern charting. As that work progresses, it seems highly likely that Access will become better at it. However, keep in mind that, for the most part, whatever resources Microsoft has to deploy for Access are more likely to go into aspects of improved data management.