> The maturity date of the pension is 67 years old.

So I'm not sure what exactly the consequences are of "reaching maturity", but I'm guessing it means that if you take money out now, you lose out on having much more money later on. This might be a reason why the pension provider advises against it.

Another reason could be for people who have a high income now (because they're still working) and who will have a lower income later. If you take a distribution in a high earning year, you'll probably pay way more taxes on the distribution than if you had waited until a low income year.

Third, you may need this money much much more when you're in your 70s than you do now.

Finally, it could of course be that the fact that it is also in their own best interest to advise you to keep your money safe with them plays a small role.