Of course they're going to ignore the fact death has been cured. Voyager did the same thing when Seven brought that abomination Neelix back to life. No writer would ever want to be confined by a plot device like death having no meaning. I also got that Lin isn't exactly enamoured with the first 2 movies and neither am I. He doesn't need to erase those movies from continuity. All he has to do is work with his own story. Fine by me since his story sounds like it has something to say. Of course it could be terrible but I'll make that call when I see it.
The way I see it, what happened in stid with Khan's blood cannot become the rule as soon as that movie itself made it obvious to me that they used the trick in those circumstances, but the sent Khan back to his previous state. It's a non issue to me because it's clear that this plot device was linked to specific circumstances of that movie.
Also, they didn't 'cure death'. For me, Kirk wasn't really dead. Sure, for a doctor he basically was, but I think he still had some vital signs (death is not immediate in reality, your body doesn't just 'stop' everything in a minute ) that's why they needed to be fast getting Khan's blood.
And maybe Mccoy analized it later and they found a way to use what they learn from his blood and it's regenerative ability, to cure some diseases that have not a cure yet (see the little girl)
I'd see nothing wrong or unrealistic about that, improvements made in medicine often are the results of stuff like that. (Lol, of course not the same stuff. )
But, again, I don't really see stid saying 'we can cure death'. (Didn't tos have examples like that too? Btw. E.g. Scotty and later in movies Mccoy giving a 'pill' to that old lady? Are we really still using the 'realistic' argument for a sci-fi thing set in the future, here?)
As for the rest, agree to disagree
For me Lin liking tos is not important (previous movies were made by guys who weren't tos fans and those were successful see JJ himself and Nick Meyer) but him being entusiastic about the reboot maybe is because, ultimately, he is working in this trek not the other. And again, I wish we got someone who had some passion and excitement for the first movies and wanted to add his stuff but also wanted to continue what was done before because he loved it.
For me, it seems like we got what was 'available' to make a conclusion the moment we lost the original creative team. We got the people who were willing to try and make another movie, or the movie requested by paramount&co, but their heart, beside tos nostalgia, isn't into it.
In fact, Lin is kind of already saying he might not return for more movies.