The feature in itself is. In order to be eligible for this, you have to store your coins in Binance, so what other downside are you looking for that could be worst than that. Congratulations to cz and binance for always coming up with ways to encourage people to store their funds in the exchange, the other time cz was saying 99% of people would lose coins on their self custody and now this.

If you are looking for an inheritance plan, i recommend you use one that doesn't put the custody of your coins in the hands of a third party, so you don't lose your coins while you are still alive, lol.