…hypothetically, would this really be such a bad thing when it comes to general tank balance?
edit:
The devs seem to agree.
The War Within Beta Development Notes for June 18th:
Illuminated Sigils now grants an additional charge only to Sigil of Flame (was all Sigils) and also reduces Sigil of Flame cooldown by 5 seconds.
A good change for currently one of the most powerful 1-point talents in m+.