People have tried to add async plugin support to vim, but the patches have all been rejected. Meanwhile, the plugin support in Neovim is worlds better.
Microsoft Word doesn't even accept patches, which I do indeed hold against it.
The patches were rejected because they didn't provide a working solution for cross platform support. The plugin system in Neovim is only "better" for people who actually want async plugins. I am not one of them.
I have only experienced a handful of vim crashes but all of them were caused by plugins.