Is it still interesting to exempt my voluntary payments from tax?

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No , it is not interesting for everyone to deduct their voluntary payments since it is a tax deferral , you will be taxed upon exit. Everything therefore depends on your marginal tax rate (TMI), the more taxes you pay, the more interesting it is to do so (below 30% of TMI, it is not necessarily advantageous) because it is estimated that you will be taxed less in retirement due to a drop in your income.

In other words, if you currently have a low marginal tax rate (MTR), the exit tax savings will be low or even zero.