The Official router does block through TOR traffic. It is an OK decision since it is an entry level router. I rarely test that version. The truth is that you do not want a lot of traffic over 30% (varies depending on conditions) through slower networks: satellite, ygg, flokinet some cell, modems, some VPNs. It does help with security but at a cost. Don't be stupid... in theory some entry guard may be able to block you unless you use your own servers. Again: If your threat model dictates it don't hesitate!