replacing openssh with something you've written yourself seems like reinventing the wheel, just because you can.
the sheer number of person-hours at developer salary rates in north america would probably amount to at least a few million dollars.
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You'd be surprised. Go actually has a supported SSH library which is a fairly decent protocol-level implementation. To actually get a "shell server" you would need to implement handling of SSH sessions (as described in the RFCs) but all the low level stuff is taken care of.
EDIT: As an example, the gogs project has implemented a small ssh server so people running it don't need to hook into OpenSSH, which relies on specific versions of OpenSSH to be performant. See https://github.com/gogits/gogs/blob/master/modules/ssh/ssh.g...
Except that OpenSSH is a very large, complicated, and featureful piece of C code that most servers need only a tiny portion of.