This is NOT OpenSSL they are working on, this is a private fork of OpenSSL that is intended for OpenBSD only.
They are taking big hatchets to interoperability code to simplify it, with the sole intent of targeting it at OpenBSD.
This is the walled garden approach to improving the software, only OpenBSD will have the *new* OpenSSL and it will be a non-compatible fork of the old OpenSSL.
I understand their personal motivations, but everyone has to understand that this does not make the OpenSSL ecosystem safer, it only makes the OpenBSD specific port of OpenSSL safer. The rest of the world will still be subject to any vulnerabilities and shortcomings in the code, because they are not intent on contributing this code back to OpenSSL.
That said, someone will have to further backport these changes into the baseline OpenSSL, eliminating all of the commits that remove interoperability.