The problem is that much like the T1 speed talents, we need to talk about the effective uptime. While yes, LAotL provides the greatest average move speed increase for a haste tank.
Lets say you have a fight where you can stand still for 99% of the fight, say you only have to move 3 times during a fight, each time the movement only takes 4 seconds and it is 2 minutes apart. In this case SoL would have 100% effective uptime since you would have it up always when you actually need to move.
It is kind off the same deal here. We do not use cooldowns for TDR, we use them for 90% for anticipated damage intake and sometimes for oh shit situations, and sometimes ofc just to use them since we got nothing else to use them on.
Often with the Tier 5 talents, its only the first few seconds that matters. After that the damage stabilises.
Sotr + 20% healing taken is better than just Sotr, there is just no arguement against that.
HA is just more situational due to more fights are designed in a favorable way to SW. That said, now that SW lost a lot in dps purpose losing the T14 4p, SW is only better for dps if you are not hard capped in expertise, and some other niches involving the T6 talents.
Though I rarely find that the small difference in dps is worth sacrificing the big survival increase from SW.
There is also another niche that I realised for SW today.
If you are predicting a long stun, you can pop SW before the stun, and have 20% healing increase during that stun when you can use no other spells or defensive cds.
Though that is more of an oddball but a good thing to notice.
Though to go back and repeat myself since I often lose my train of thoughts in posts (lol).
" but i also feel that in the situations where the prolonged ShoTR uptime falls into TDR, 20% additional healing isn't necessarily more attractive"
That was kind off my point exactly. In almost every situation, after a short duration, both SW and HA falls into the TDR category, the 20% increased healing is not to bad since the damage in take is low here. So, SW and HA becomes equally attractive (read as: unattractive) after a while, making that really irrelevant, though before the point, SW is undeniably stronger.