ARR+ doesn't even use Crystal Tools, really: it's a bespoke hammered together ship of Theseus made out of the bones of Crystal Tools, pre-pro Luminous Engine, and those unlucky programmers who got close enough to its core; glued together with thousands of hours of 'anything goes as long as it works' breakneck labor. It's janky because they're building the track under the train as it runs, not because of relics from 2010. (Mostly.)