The annual review has a reputation as an administrative formality — a fee, a signature, a filing. That reading is understandable and it is expensive.
In practice it is the only scheduled point in the year where somebody looks at the whole entity at once: the activity it actually carried out, the substance it can evidence, and the tax position that follows from both.
The three things being checked
The first is whether the activity on file still matches the activity in reality. A company incorporated to hold shares that has quietly started invoicing for services is now a different entity for tax purposes, whether or not anyone has filed anything to say so.

The second is substance: headcount and operating expenditure in Labuan, tested against the requirement for that specific activity. This is a count, not a judgement, and it is either met or it is not.
The third is the filing calendar itself — the annual return, the tax return, and anything the entity's licence adds on top.
Why timing decides the cost
A substance shortfall found in month three of the financial year is a hiring or expenditure decision. The same shortfall found after year end is a tax consequence, and there is no longer anything to decide.
That is the entire argument for treating the review as a review rather than a renewal notice. The work is identical; only the date changes what it can achieve.
What to bring to it
Have the year's actual activity to hand rather than the intended activity — bank statements and invoices tell the truth more reliably than the incorporation documents do. Bring the payroll position and the Labuan-side expenditure, and flag anything that changed mid-year.
Anything that looks like a problem is worth raising early and plainly. There is almost always a route through it while the year is still open.

