The missus reckons it's good to do this. She says it's better than keeping cash in a bank account. It's lower risk than iDeCo. It's guaranteed to increase, even if the rate is low. There are no fees. It's easy to set up and requires no management.
That is largely true.
My missus also had us lock away money in a "Gakushi Hoken" product after our first kid arrived, which is also from Nissay, and also the returns of 120% (years from then) looked better than nothing, providing I pay in the "premiums" over the first 10 years.
I was against it at the time, but gave into the pressure after at least finding a "Gakushi Hoken" product that wasn't certain to lose money. Yes, when I looked at alternatives from the Post Office initially, I found that they were guaranteed money losers!!
The Post Office man and the deceived aunts would say "well that's because insurance isn't free", but remember the insurance company gets close to 2 decades to make money out of your money, instead of you and your wife making the money with it instead.
So what you do lose with such insurance products, is the opportunity to make the money work more for you or use it as you please during that time.
By the time our second kid arrived, I was into investing though NISA, and armed with more knowledge, managed to convince my wife that not locking ourselves into another "Gakushi Hoken" product was a smarter idea.
The compromise approach is a good idea. Give her a bit of what she is comfortable with, and request to do a bit of what you are comfortable with. Compare the results as time goes by and your knowledge and comfort increases.
My wife has a NISA account now too, which she is comfortable with me maxing out (thanks to the stock markets not crashing recently, but I have told her that if they do crash then we will be buying more, not selling out of fear.) so minds can change over time.
She sees no good reason to not do it in addition to iDeCo.
It's better than putting it in a term deposit for 20 years, I grant you that.
But the prime beneficiary of that use of your money, is the life insurance company. They are basically paying salaries and office rent off the backs of risking your money instead of you, and giving you a tiny bit back years from now, as well as potentially paying a life insurance claim if you all get unlucky.
Whatever you do, don't commit too much money to such a scheme. Commit only as much as you need to to keep your wife content. And over time, learn about passive investing (hopefully with her), and so long as she doesn't get annoyed, keep mentioning to her how the US Dow Jones stock market index is 30,000 now whereas it used to be 6,000 some 30 years ago, and how long term buy-and-hold investors do pretty well!