Implementing Agile Accessibility in a project does come with certain challenges and potential drawbacks:

1. Lack of Clear Processes: Agile methodologies often encourage teams to operate with a lot of autonomy and flexibility. However, this can sometimes lead to teams getting sidetracked, particularly if there aren't enough processes in place to guide them. Without a clear vision or sufficient documentation, teams may struggle to stay focused on the project's goals, leading to scope creep and potential delays.
2. Difficulty Maintaining Collaboration: Agile methodologies emphasize continuous collaboration among team members. However, this can be challenging to maintain, especially in larger teams or across geographically dispersed teams. It requires additional time, commitment, and coordination to ensure that everyone is aligned and working towards the same objectives.
3. Challenges in Measuring Progress: With Agile methodologies, there isn't a fixed end date or final product specification, which makes it hard to measure progress. This can make it difficult for stakeholders to understand what's being achieved and whether the project is on track.

To mitigate these challenges, it's important to establish clear processes and guidelines, foster strong collaboration, and set up systems for regularly assessing and communicating progress. Tools like project management software and visual representation of workflows can be useful in facilitating these efforts.