I think "good enough" is not a perfect mentality for what we want from our services. Ruby 3x3 is great (3 times faster is insane!), and we are looking at many things to optimise Ruby. TruffleRuby does aim to get more than 3x faster (already does on optcarrot) and could also provide some insight to be applied elsewhere. Other reasons include TruffleRuby features such as Chrome dev tools debugging (I'm not endorsing it as superior or inferior to any existing Ruby debugging tools) and polyglot programming. All in all, the goal is most accurately described as "research".