It's a good point, but it really depends how our brain will perceive time. It might be that reducing aging also means enabling with more energy which in turns allow you to stay passionate and curious

An additional benefit of longer life would be that, given a longer lifespan, individuals are naturally gonna focus on more long term priorities

Our species used to need death to evolve (death means more birth which means more genes mutations). But today, there's no longer a survival pressure that make our genotype evolve (yes there is a reproduction pressure still but it's doesn't make us evolve in an interesting way any longer).

So it's say that, no we no longer need death today

Death used to be an important feature for the evolution of our species. Now we can argue that it's no longer the case and that it's relevant to try and delay it