I have used the stand-alone Windows ZIP file (with just tor.exe) in it with great success: https://dist.torproject.org/torbrowser/8.5.4/tor-win32-0.4.0.5.zip
However there doesn't seem to be any counterpart for Linux and OS X.
There is the entire browser bundle, e.g. https://dist.torproject.org/torbrowser/8.5.4/tor-browser-linux64-8.5.4_en-US.tar.xz
But this is much larger and contains an entire web browser in addition to the Tor binary. Why is this?
I understand many people on Linux get Tor via their distro package manager but it's strange to me that no trimmed down offering like the Windows ZIP is available.