[setpatchaddress]

Depends on what you mean by "native". The core is compiled to a native binary. But it doesn't use macOS native text editing or UI idioms beyond the level of windows and menus. If you don't want to use TextMate, you might as well use Visual Studio Code instead, which is closer in spirit to the native Mac idioms and is easier to configure.

[dictum]

I'm not well versed on the specific implementation details of ST, but whatever the ST team does on macOS yields a result that is much closer to a native application than VSCode does through embedded Chromium. The difference in text rendering is particularly noticeable on a non-hidpi display.