Nah. How did Twins possibly make the game better in the grand context of things? I could take a level 30 with agi twins and crit people in the nearby levels for five times their max health. Level curbing of abilities helped, but honestly, there shouldn't be a need to do so. It's symptoms of a bigger issue. And at the end of the day, the issue is P2W powercreep in a highly exclusive have or have-not environment. R:BF's pop died out with epics and upgrades not because of bad balance or time investment, but the sheer fact that it was pretty much impossible to climb out of being a have-not without major assistance from big-name guilds or P2W spenders.

2008 was the best this game ever was, and likely ever will be. People didn't die in two hits, either, unless they were just bad or massively underleveled/geared. A player in good gear in his 70's was an endgame or 8x/9x threat enough to take them damned seriously Combos dropped people 10-15 levels up if they weren't paying attention. Strictly speaking, the pace was fast, yes, but the combat itself required some mental acuity, and success was found in a mixture of gear + skill. AA resets and every little cooldown mattered. Good-enough gear wasn't IM-dependent or expensive to make. Costumes gave +5 stats and 30 pdef/mdef and were hardly mandatory because of it.

Most skills had barely any difference between 6/7 and there was little incentive to spend a ton monthly to stay competitive. Minigame (B5/L7/nopoly)stat scrolls didn't even exist - just wraths, sprint scrolls, and some other minor junk in the mix. In no other time has this ever been the case.
Twins were a good QoL buff to offset the intense needs for crafted accessories and the insanity of powercreep someone who spent a ton of money on the game could achieve. However, hard-stat-capped R1-R4 rings with a low level requirement were amazing because the gains level-to-level between a well-geared level 60 character and level 99 only differed in raw stats mostly from the actual point investments from builds. The rest was gear amp from %'s.

A lot of the rest of the problems just happened from over-farming and obvious best-choices for PvP as far as option items went (DD).