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> How can you say that when longevity isn't available to all in the current days?

Because technology inevitably becomes cheaper. Your smartphone did not exist 20 years ago, and 15 years ago only the rich could afford it. Today the whole world has one. Such is the way of technology.

> Of course there's a renewal process, old habits, vices, skewed and biased perspectives of the world are all flushed and reset with death.

Let's say people lived forever. Would killing them at 80 years be justifiable because "we need to flush out their ways of life?"

Humanity can progress without death. It might be slower, even glacial, but that is completely irrelevant because you will experience more net progress in the end.