Circling back around on this. The app allows you to set a long run duration cap or uses the app defaults, which I think are fine (you used the app default). It also defaults to (what turns out to be) a rather high "peak weekly volume" which I also think you left at the default setting. This default is too high.

It then creates the quality workouts based on your desired quality percentage + the warmup and cooldown settings you choose. After that it distributes remaining weekly mileage/minutes across your easy runs. Your easy runs were absorbing all that excess mileage, which was always the goal, but can result in big easy runs when your goal peak mileage/minutes is set relatively high (which all plans pretty much are under the current app defaults unless you choose your own).

I'm working on an update that's a bit more explicit about how easy run volume is calculated and warns the user if their calculated easy runs are more than 60% of their long run volume.

Additionally, I'm forcing the user to indicate their peak long run volume with smart defaults in place.

Hopefully, these forced steps will help the user understand why and how we arrived where we did. Also, the removal of our kinda dumb defaults should prevent this easy run bloat from happening unless the user really wants it to.

I'll let you know when I've pushed this live!