I appreciate that you’ve taken the time to run the numbers. I guess – for me, at least – the issue isn’t that it’s three events running concurrently; it’s that there are three events running concurrently, and one of them is Guild Wars.
If we had ToD and Invasions running as week-long events, along with, say, a bounty or a weekend faction event (i.e., a new faction), I could probably manage that along with the weekly faction and class events and a campaign. But GW matches take me between 20 and 30 minutes each, if each opponent fields a different team. I could run five whole delves or five complete pet rescues in the time it takes me to do a day of GW. Because it’s never one battle; it’s two or three practice battles; it’s discussing teams and tactics with guildmates; if you lack one of the opponent’s troops, it’s requesting that someone else assemble that team as a defence that you can try things on.
And then add to that the pressure of extracting the maximum forge scrolls out of ToD, because you’ll not have another shot at them for sixty weeks (and then doing your 200+ floors or letting all those sigils rot). The whole thing is a death march.