You are right, you ARE wrong. ;^)
It isn't just an analog, Linux is the "clean room" copy of UNIX™, not the other way around.
What do you think your "text" is? It is the Linux analog of a UNIX™ Terminal. Linux is a UNIX™ work alike. OSX is UNIX™ and in fact is one of only five certified IEEE POSIX compliant Trademarked UNIX™ operating systems licensed by the The Open Group, the organization that maintains the standards of UNIX™. Apple OSX is the largest selling UNIX™ in the world.
Apple OSX, IBM's AIX, HP-UX, Silicon Graphic's IRIX, Sun's Solaris are the five UNIX™ operating systems still in production. Both Apple and IBM had previous versions for their earlier processors.
What are you looking for is a fully text interface and that what TERMINAL is. When using Terminal, you are talking with the underlying operating system but you have limited access as you are not logged in as a SUPER USER. For that you need SUPER USER access.
If you want to boot into UNIX™, you can. It is not advisable. However, if you want to, simply restart while holding command (Apple)- S. You'll boot to a text screen, with a prompt. You can type reboot, and press enter to reboot normally. You most likely still won't have the right user permissions for access unless you know how to set them using SUDO. You can do that using TERMINAL as well.
Apple Mac OSX Single User Mode. . . UNIX ROOT
The Toolbox is still there. Quickdraw is still there only a lot more powerful. You just THINK it is a straight jacket because you don't know how to use it. A fine tool keeps out of your way when you use it. You don't have to keep working ON it instead of with it.
That is why intelligent people choose Macs and not Windows computers. My home Mac has Windows (three versions), Linux (two versions), iOS, and several other operating systems running on it. . . so that I can better support my clients. All of them run in sandboxes under OSX. . . sometimes simultaneously. And of course I have access to the full power of UNIX when I need it (seldom).
At my office, we just run OSX. . . and just one instance of Windows 7 (which we do not allow anywhere near the internet) in a sandboxed window on one of our iMacs to run an specialized application that is not available on the Mac.
OSX on a seven year old MacPro runs our 3D Panelipse X-RAY Tomography system. 3D Tomography is no slouch in computational demands. The rest of our radiographic needs are handled by four MacBook Airs feeding into our Mac Mini Server which handles our database, while other data is handled by multiple iMacs also tied into the same Mac mini server. The Mac mini is connected to a RAID backup system.