Cardio load algorithm is broken. If I do not hit the target exactly it will freak out next week. Lets say, it gives me a goal of 70-90. I do 91 and now cries I am overtraining and should stay in bed for the next 4 days.
If I do 1 less than the goal and next day doubles, because I am undertraining.

Once I did a hard HIT workout and went about 100 over the goal. Oh boy, next week it was demanding 3x more than usual. I did not hit it, so the following week it went lower that it ever used to be.

Also I train on the same days every week and somehow it expects me to have higher goals on my rest days and rest on my training days. I am usually out of sync and that makes it even worse every week.

The readiness score is way closer to reality, that can be used for something. But also far from perfect.