I feel the need to point out that what "ships" with elementaryOS is basically meaningless. You can install what you want, easily, and the default configuration is a recommendation. Welcome to Linux-land. https://www.distrowatch.com/
Oh, absolutely, but I'm actually saying the terminal that ships with Elementary is superb. The macOS stock terminal is also really good. But the Windows stock terminal is downright horrible, Powershell is slightly better, but not Unixy, and ConEmu is so-so, but better than the other Windows options.
No, it isn't. Debian packages, Ubuntu packages, etc. are tested together as a group and you can expect that they integrate properly. The same cannot be said for third-party OSX .apps. They're more like adding another repo to your sources.list. Hell, OSX won't even let you uninstall Terminal.app.