What are the key considerations when choosing an ebike for group rides and social events, particularly in terms of balancing the need for speed and efficiency with the desire for a more casual and social experience? Should riders prioritize ebikes with higher power outputs to keep up with faster groups, or would models with more subdued assistance profiles be more suitable for social events where the focus is on camaraderie and conversation rather than raw speed? Are there any ebikes that have successfully struck a balance between these competing demands, and if so, what features do they offer that make them well-suited for group rides and social events? How do factors such as battery life, gearing, and weight distribution impact the overall experience of riding an ebike in a group setting, and are there any emerging trends or technologies that are likely to shape the future of ebikes for group rides and social events?