You didn't cite the biggest advantages of neovim: for example, the possibility to embed neovim inside IDEs or background processes. You did mention the new plugin architecture, which is quite exciting.
Regarding the support of old machines, it doesn't matter at all, really. Even vim 1.0 would be enough for old machines. I'm not aware of anyone that wants to develop in an old machine. At most, you might need to ssh into it, and even vi is good enough :-)
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You didn't cite the biggest advantages of neovim: for example, the possibility to embed neovim inside IDEs or background processes. You did mention the new plugin architecture, which is quite exciting.
Regarding the support of old machines, it doesn't matter at all, really. Even vim 1.0 would be enough for old machines. I'm not aware of anyone that wants to develop in an old machine. At most, you might need to ssh into it, and even vi is good enough :-)