Does the enablement requirement necessitate a commercially viable embodiment?

No, the enablement requirement does not necessitate a commercially viable embodiment of the invention. The MPEP clearly states:

“To comply with 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, it is not necessary to ‘enable one of ordinary skill in the art to make and use a perfected, commercially viable embodiment absent a claim limitation to that effect.’“

This principle is supported by the case CFMT, Inc. v. Yieldup Int’l Corp., 349 F.3d 1333, 1338, 68 USPQ2d 1940, 1944 (Fed. Cir. 2003), where an invention for improving semiconductor wafer cleaning was deemed enabled by disclosing improvements to the overall system, without requiring a commercially perfect version.

Specification Must Describe How to Make and Use Invention MPEP 2164 Informative
Enablement Is Separate From Written Description MPEP 2164 Informative
Claims Must Be Enabled by Description MPEP 2164 Required
Specification Must Describe Invention Completely MPEP 2164 Permitted
Specification Must Describe How to Make and Use Invention MPEP 2164 Required