I don't quite follow this discussion.  The instructions clearly stated partnerships with NO international tax relevance are exempt from filing Schedules K-2/K-3.

From the draft Sch K-2 instructions.  Emphasis added.

Who Must File

The partnership need not complete this schedule if the partnership does not have items of international tax relevance (typically, international activities or foreign partners). Any partnership required to file Form 1065 and that has items relevant to the determination of the U.S. tax or certain withholding tax or reporting obligations of its partners under the international provisions of the Internal Revenue Code must complete the relevant parts of Schedules K-2 and K-3. See each part and section for a more detailed description of who must file each part and section. Penalties may apply for filing Form 1065 without all required information or for furnishing Schedules K-3 to partners without all required information. The penalties that apply with respect to Form 1065 and Schedule K-1 apply with respect to Schedules K-2 and K-3, respectively. See Penalties in the Instructions for Form 1065.

Note. Except as otherwise required by statute, regulations, or other IRS guidance, a partnership is not required to obtain information from its direct or indirect partners to determine if it needs to file each of these parts.

Note. A partnership is only required to complete the relevant portions of Schedules K-2 and K-3, as applicable. For example, if the partnership does not own (within the meaning of section 958) stock of a foreign corporation other than solely by reason of applying section 318(a)(3) (providing for  downward attribution) as provided in section 958(b), it is not required to complete Schedules K-2 and K-3, Parts V, VI, VII, and VIII.