Because extending trust usually works retrospectively?
Or
which battle tested applications exist today using crypto+, that illustrate it's a better choice than what sofar held up under libsodium (which is a lot)?
My comment was intended to be constructive, not to spark a flamewar. If you compare Crypto++ and Libsodium, you’ll notice they were created in different decades. This reflects that, at one point, C++ developers predominantly used Crypto++, while later, Libsodium emerged as an alternative.