Superannuation is very very similar to the 401k honestly. I remember when Australia brought in superannuation system and the biggest pushback was that it was blatantly a move to the us system (we had government pensions in the 90s). The tax treatment isn’t that different since 401k contributions aren’t taxed like income either. I work for an employer that pays 15% 401k contributions on top of salary. The main difference is that employers aren’t required to pay 401k contributions and I think that would be the better point to make.