Adapting ECU after timing chain has been renewed

I'm going to replace my timing chain in my Toledo 1.2 TSI with CBZB engine. The official Seat procedure from ERWIN says:

- The engine control unit must always be adapted after the timing chain has been renewed or after the previously removed timing chain has been reinstalled.

- Depending on whether a new or a previously removed timing chain is being installed, different procedures for adapting the engine control unit apply.

- If the learnt values are not adapted, consequential damage may result.

- Not all engine control units support the procedure described below. If the engine control unit does not support the function below, the described procedure is not applicable.

Using VAS-PC:

Press following buttons on display one after the other:

1 Guided Fault Finding

2 Select vehicle

3 GoTo

4 Function/component selection

5 Select engine version

6 Timing chain removed/installed

I have experienced before (when wanting to trigger the function for re-calibrating end stops on the HVAC flaps), that even the very comprehensive system that is owned by a competent mechanic who I know, cannot access some functions, and therefore may not be able to access this one. How critical is it that it be done? I believe that the ECU will learn over time any differences introduced in replacing the chain, but I also understand that any averaging that it does, will be based on a much longer history already in the memory - hence their instruction that it must be adapted. So I think if not adapted, it will just take some mileage to re-adapt itself, but the question is, is there any harm in this?