AI Hasn't Fixed Teamwork, But It Shifted Collaborative Culture: A Longitudinal Study in a Project-Based Software Development Organization (2023-2025)

When AI entered the workplace, many believed it could reshape teamwork as profoundly as it boosted individual productivity. Would AI finally ease the longstanding challenges of team collaboration? Our findings suggested a more complicated reality. We conducted a longitudinal two-wave interview study (2023-2025) with members (N=15) of a project-based software development organization to examine the expectations and use of AI in teamwork. In early 2023, just after the release of ChatGPT, participants envisioned AI as an intelligent coordinator that could align projects, track progress, and ease interpersonal frictions. By 2025, however, AI was used mainly to accelerate individual tasks such as coding, writing, and documentation, leaving persistent collaboration issues of performance accountability and fragile communication unresolved. Yet AI reshaped collaborative culture: efficiency became a norm, transparency and responsible use became markers of professionalism, and AI was increasingly accepted as part of teamwork.