My only other points as of now would be that for IB, it's still a time limited event similar to Queen's Wrath even though it does come back. For ToO, achieving something like 7-3 may not be very difficult, however it would be measuring your capabilities in PvP over the course of just one week. Yes, you could do it another week, but if you screw up one week, then that's a whole 1-7 days that you are not able to complete it if you have 4+ losses. Hard Mode on any Raid can be done any time as well as Golden Chests, Public Events, Crucible Wins, etc. Hence, ToO is a time restricted event.
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That's a valid point. I'll take that. Time restriction is indeed there. All I have to say to that is that there's still plenty of time to do them. It's like back in high school where you had 2.75 months to do a group project. But the group could only meet on the weekends. To me, you still have plenty of time to get it done.