Just guessing but possibly no triatic to support the mizzen truck against the pull back of the sail on a beat.
It looks like the lowers do all the work of keeping the deck-stepped mast up with running backs for added gusto.
They probably don't even set the mizzen on anything past a broad reach in moderate wind and with all that pilothouse stuff they sure wouldn't fly a mizzen staysail. So supporting the masthead from behind is not important and this way the uppers do their normal job plus eliminate that often annoying triatic. Still, a bit quirky.
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