A bit OT but would be interesting and useful to know...whether one needs to fill in the form or not would logically be dependant on your nationality (passport), not the airline you arrive on. I last flew in to CGK on MH and had (to fill in?) the form. IIRC previously on CX didn't have it. Does someone actually know the rules for this?
Immigration requirements are, of course, driven by nationality (among other factors), not the carrier. If you are blessed with a passport entitling you to visa-free entry as a tourist, then no form is required: your passport scan, supplemented by direct questions, will provide the information required. Be prepared to be asked if you are a tourist: don't prevaricate, reply firmly that you are - otherwise the right to a visa-free entry evaporates.
It's possible there's some confusion about customs forms and immigration forms. Completing the customs paper-work is a general requirement, though officials just might wave you through if you have not completed one.
It's hard to imagine the frustrating and time-consuming faff required before the current system was implemented. Forms galore, queues to purchase visas .... then more queues for immigration.