Why do some journal editors request that we present the main effects when the interaction is also significant? Is "for sake of completeness" a good enough reason?
What is significant that should be expressed as ANOVA is a justified methods
Well, the reason you ran an ANOVA in the first place is, presumably, because your hypothesis was predicated on the finding (or not finding) of main effects. Yes, of course you would report interactions, although with respect to that, you may want to consider an ANCOVA or MANCOVA. Remember also, that with the GLM, regressions and partial correlations may reveal things in a more succinct way, and especially the latter can be useful when attempting to partial out effects.
Usually, one should report all that is needed to reproduce the results elsewhere, or in comparable contexts. So it may be that main effects are considered as an intermediary and necessary point of reference in such an eventual process of reproduction?
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