If you're already down to the command line, running UNIX commands, and using TLDR you are way beyond "buying fish at the supermarket".
And why should you "learning how to use those tools", when what you really want from those tools are the use cases TLDR already covers?
My eyeballs are strained from rolling every time I read some very sage person on SO or HN reply to a well-phrased question or comment with a terse "it's all in the docs".
As if 90% of use cases aren't covered by 5 examples. As if we all have unlimited time to spend on reading docs and manpages and "learning how to use the tools". As if there is some intrinsic virtue to "learning how to use the tools". As if the very purpose of sites like SO are something other than distilling the information in docs into some other, more readable form. As if there are no man pages or docs that are absolutely incomprehensible and worth ignoring.
No, sorry, this attitude is just another manifestation of standard tech machismo: "real men do it the hard way". Good luck with that!
In the `tar` case if you know what c, x, v, z and f stand for you can cover 99% of the tar use cases because those can be combined. You learn 5 letters and have now access to 8 different commands (`{c,x}[v][z]f`). Learn one more letter, `t`, and you can combine it with your existing knowledge to have 3 more commands (tf, tvf, tzvf).
Tl;dr: Blame the software stack.
But I agree completely. The entire point of computers is doto mechanize doing things, to essentially be "lazy", aka more efficient.