C++20 concepts enable complete conceptualization of the C++ language. No longer does your code have to actually do anything. Rather, it can conceptualize concepts into abstract templated classes purely for aesthetics with no functional value.
The conceptualization brought about by C++20 concepts demonstrates how C++ is becoming less of a "practical" language and more of a "toy" language. You literally spend most of your fucking time creating the most contrite complex way to represent an otherwise simple object using templates, enums, const, constexpr, and other stuff. It's fun and it gets you high, but you ultimately waste most of your time figuring out the most expressive possible way to write code and totally lose sight of the end goal of actually getting stuff done and making things happen.
The super-strong liquid left at the bottom of your mug after a teabag has been left in your now drunken tea. This usually occurs as a result of failure to completely drink the beverage or dispose of the teabag beforehand.
A word artsy people use when they don't actually have an explanation or strong idea for what they did. Basically in this sense, conceptual can also mean "my bullshit"
Art Professor: So what are you interested in doing?
Art Student: I'm thinking about doing a film, but not narrative or documentary or performance piece. Conceptually it's abstract and, uh....It's just a very conceptual piece.
Art Professor: You have no idea what you're talking about, do you?