Nothing wrong with improving quality of the life we do have, which naturally would mean increasing lifespan a little. In fact, I'd argue that's precisely the right way to spend resources - quality, not quantity.

I'm not at all against small increases in lifespan, and certainly for improving quality of life (e.g. defeating disease). I'm specifically against individual immortality because I strongly suspect it would quickly and inexorably lead to stagnation and death for our species.