I have concrete block CYV. My dryer vent out on the back wall due to location of washer and dryer connections. Even though it mismatched with the dryer vent it's through the concrete wall. I guessing you're design has the dryer on inside wall which usually leaves nowhere to vent except straight up?? I can look at the design of houses and tell which have dryer venting through the roof by what's sticking up on the roof. IMO another problem is venting between studs in the wall up through the roof. The ducting used to fit in the wall studs are not 4" in diameter, there smaller and IMO along with gravity compounds the problem, which leads to that design to be cleaned out mimum annually?
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