Reading the manual once will save you a lot of time reading TLDR over and over. Which is not to say you won’t read it; but you’ll read it less than without reading the manual first.
I find this hard to believe. You probably need to read the man page and perform the action over and over again.
At least personally, I need to do thing X and to achieve that I know I need to use tool Y. I read the man page of Y and very satisfyingly do the thing X. A month from now I have to do something similar to X and cannot for the life of me remember what freakish incantations need to be performed in order to do the same thing so I have to go through the man page again. This is where I'd like the tl/dr of it. I don't need Y often enough to actually warrant spending much time on learning to use the niche cli it requires..
I doubt that. I don't try to memorize commands (even more so - manuals), so it's more like I'm reading manual over and over again, which takes more time than reading TLDR. I agree that it's important to understand what command is used for and what capabilities it has, but trying to remember all these flags by heart is waste of limited brain resources imho.