To see if Jeeves is telling the truth, I performed a little experiment. The conclusion is clear: gained skill points to skills above 340% are not assigned and are LOST.
I have this player - well power trained a few months ago - looking like this:
Attachment 92160
I used 150% rest (10 green packs) on stretch training. None of these trainings gained any skill points, as expected. After that, I performed a training with 1 slalom dribble drill. This was the result:
Attachment 92161
Next, I used 150% rest (10 green packs) on goalkeeper training. None of these trainings gained any skill points of course. After that, I performed a training with 1 slalom dribble drill. This was the result:
Attachment 92162
So using training a drill with skills above 340% is not quite the same as goalkeeper training. The latter saves the gained skill points, while the first does not. So it absolutely makes sense to avoid these training drills.
I’ve been trying to avoid those drills for the last month. My conclusion is: you cannot. I need to train my players in groups for the training bonuses. The daily training scheme for my entire team contains physical skills. This is unavoidable. My players kept gaining points for physical skills. These are useless and slow down the progress in other skills (since they count for the overall player strength). The last disadvantage is no longer applicable, but the skill points above 340% are now lost forever. They will not come into effect when I promote and the skills drop below 340%. I really don’t know what’s worse: the situation before or after this update.