Not sure how this turned into just a rajas vs tamas ring topic
But I guess since it has...
Rajas even not endgame doesn't give up that much accuracy no matter what, since the DEX+3~5 also gives some decent accuracy back. Plus it gives increased critical hits which are kinda priceless. Plus as other ppl like lockercole pointed out,
all 4 stats are useful at the same time for melee, you hit harder, with more chance of criticals, more accurately, with more tp back, and giving less tp to mobs, all this for every single punch and ws you do, all are active at the same time. Even just the DEX+STR is like having 4-5 slots for rings.
If you really care a ton about accuracy, eat sushi i suppose. It's not quite as good as atk foods for damage but if you have accuracy problems it will solve them better than a single acc ring. If you eat meat you already decided boosting acc is not your 1st priority, so you still likely want raja in place of a very small acc boost from a ring.
About Tamas, you could get most of those effects from other rings but you don't get to benefit from all at the same time, usually just from 1 or 2 (emnity- and either MND or INT or mp while resting), like many people also pointed out, because of how spells work. But not having to swap can at least be a space saver which is a small benefit but still kinda cool. Also the emnity- is somewhat unique.