Considering that two or even three deaths in all content is quite capable of being recoverable...I don't really see your point?
If your tank is down long enough that the tankswap mechanic comes along again, or DPS down long enough that you hit enrage, or your solo healer is incapable of using AoE heals, those are different issues altogether.
There are issues with end-game right now. No one is denying it. Blaming it solely on DEATHS and one shot mechanics is, IMO, not feasible at all.