One meta belief I have, is that I think "on the face pursuing idealistic objective A, but actually being tilted toward selfish objective B" is better than "openly pursuing objective B".

Many seem to believe the opposite, typically saying something like "at least the latter is honest".

I feel like what this misses, is that maintaining the face of pursuing idealistic objective A, and using A to coordinate a large coalition, is a pretty big speed bump against attempts to pursue B too brazenly. When "the mask comes off", things actually become much worse, and strategies that pursue B at high costs to other values (including A, and also often general human decency) become unlocked.

Are there any good arguments against this intuition I have? (Whether generalized, or about specific situations)

This adds even more ambiguity and increases the chance of conflict within a community, when it’s hard enough to somewhat align a community in DAO contexts (seen that even within working groups and core teams). We also have language barriers, cultural diversity and rarely get the chance to build up in-person trust, so I‘m doubtful how this theory works out in practice.