First off, SLT is a major raid stabilizing tool, of equal or stronger power than barrier because t makes all AoE heals stronger (less overheal.) the only thing it is worse at is surviving a single big hit.
Second, revival buff is still in the patch notes, stop saying its removed and they're trying to buff certain classes. They're trying to make healers in 25m without real raid CDs...have raid CDs. At the moment, DR effects scale in 25s but throughput doesn't as has been mentioned. Either throughput should be buffed or DR be nerfed to be fair. They chose to buff throughput, I fail to see that big of a problem.
Third, our rsham has highly competitive healing on fights where healing rain can be used effectively, as well as the utility of being very strong when the healing is needed + tons of raid CDs and MTT.
The health redistribution of SLT is highly overrated and is nearly useless 95% of the time. In situations where SLT is typically used in a 25 man raid (P4 of Iron Qon, Rampage on Megaera, etc), the entire raid is taking lots of damage. The overhealing factor doesn't mean much in those situations; people are generally not topped. The fact that it levels off HP makes it look really strong on raid frames because its very visually noticable, but the actual value of it is dubious at best outside of fight gimmicks that allow it to bypass healing debuffs. The real value of SLT is the 10% damage reduction, which is half as strong as any other DR cooldown, plus is sadded to a short duration and positional requirements.