I always thought 30s for the aero power up was nice, but too long/powerful.
Zwift publishes a brief change-log in the “What’s New” section of this forum. However, it is not published for each release/update. It is May 2019 and how many updates have we had this year? Yet, not a single “What’s New” entry.
If you check the App store (i.e., iOS, tvOS), it’s the same for each update, “Bug fixes and enhancements” or “Minor enhancements and bug fixes”. Zwift is not the only app developer that does this. But, this is so lazy!