That's true, but I don't think it'd be a problem since you won't be able to really understand how something works and eventually you'd not know how to use the t

That's true, but I don't think it'd be a problem since you won't be able to really understand how something works and eventually you'd not know how to use the thing. There's always a wrong way to use something. The good thing is that this is not being promoted as a replacement, but rather a helpful addition. I see it very useful as an alternative to hunting down for tutorials before you want to use some tool to figure out the details (a good example in this case would be something like lxc/lxd) or as a quick memory jogger, the examples that can be provided in a tldr man page could even have a specific context, like a cheatsheet kind of a man page.