Modifying plans for ultraendurance, seems to override 'safety' margin

[JoeX]

@JoPage

surely that is what TR is supposed to do? Give me the optimal training volume for my event?

So you tell TR what time you have been training, and what time you have free for training plus other stuff. It then recommends workouts. In Plan Builder it will recommend frequency, length and intensity of workouts which you can choose to override.

This post from Zach might help understand the philosophy:

What's the logic behind 30 minute workouts in Plan Builder?

As @Slowwithouttwitch said, the logic is generally to give you the number of workouts per week as requested in the Plan Builder setup flow while maintaining a similar volume to what you’ve recently been doing. Adding the volume to a different workout may trigger Red Light Green Light warnings (it seems to have done so in your case) if it “upsets” the TSS balance of your overall week. As an example, yellow/red days often start to pop up after multiple higher-stress days in a row, which I’m guess…

If you edit your plan to increase time available, Plan Builder should then warn you that you’re exceeding capacity.

I think you must be changing workouts in your calendar directly if you’re getting no warning?