A certain EU consumer protection group argues oakmoss causes allergies. Therefore, they are lobbying to get it banned. It is estimated that it causes allergic reaction in a small percentage of the population.
Is it a big deal? Not really. If the worst happens and it gets banned, then the affected fragrances will be reformulated. As for TdH, I doubt you will smell the difference if reformulated.
I wrote post on the topic some time ago. Check it out for more info:
Hope this helps.