Nothing technically wrong with it. Some drywall manufacturers recommend a coat of quality flat paint as a first coat after finishing. From the USG joint compound specs,
"A prime coat of Sheetrock brand First CoatTM primer or a good quality interior latex flat wall paint with a high solids content should be applied undiluted and allowed to dry before decoration. [painting]"
There are valid reasons to use specific primers in some situations. Personally I prefer painting over a better sealed surface than flat paint provides and often use something like Zinsser 123 instead. However there's nothing technically wrong with using flat paint as a first coat over properly finished and dusted gypsum panels, especially if it's a textured ceiling. It's commonly done.
Biggest drawback in finishing without a primer that at least seals somewhat is subsequent coats are harder to apply because of the high porosity of the surface.
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