I suppose if your company prefers to build over buy, you won’t be exposed to the kind of knowledge and vocabulary that buyers in the space use to orient themselves.
Here are some things that counter this:
https://users.ece.cmu.edu/~adrian/731-sp04/readings/Ptacek-N...: A paper that rocked the security industry at the time.
Tptacek also was cofounder of Matasano, now part of NCC; also cofounder of Latacora.
More info: https://sockpuppet.org/me/
Also the co-author of https://cryptopals.com/, https://microcorruption.com/login.
The author of https://www.latacora.com/blog/2018/04/03/cryptographic-right..., https://sockpuppet.org/blog/2015/01/15/against-dnssec/, https://sockpuppet.org/stuff/dnssec-qa.html,
These are about what I call hard-core security, hardly insanely niche, and hardly lacking critical knowledge.