w_tom writes:

IBM top management undermined OS/2 - especially its greatest
anti-innovators - John Akers and Jim Cannavino. Nobody would
write a new Operating System in assembly language. And yet
that is exactly what IBM managers did with OS/2.

Writing an OS in assembly language is not necessarily a bad decision.
OS code quality is a function of the people you hire to write the code
and the way you manage the project, not the programming language you
choose. Assembly language has the advantage of being extremely tight
and fast; but it's not very portable.

OS/2 died for reasons independent of being written in any particular
language, as you explain elsewhere.

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