I still find such a discussion from a new employee very stupid. Then I simply offer a compensating variant, and if it’s just fifty or a hundred on salary, which the employee can then use for their own further development. I don't immediately offend a new employee, as I have a strong interest in the position being a complete success. Saving a few bucks is – I repeat myself – incredibly stupid. Stinginess is really totally uncool.
Well, I can understand both sides.
The employer wants to save on administration and is offering something.
The employee has an old contract and does not want countless contracts. The job market is such that you don’t stay somewhere until retirement.
We’ll see if we make the new contract or rather open a private account and save in funds/securities. The employer’s surcharge is not a fortune, and one would have to see what tax savings it brings.