Minimal or sealed ventilation shoes are built for cold and wet riding conditions. With few or no ventilation ports, they trap warmth and block water from seeping in, keeping your feet comfortable when temperatures drop or the weather turns nasty. They're ideal for winter riding, rainy commutes, or if you regularly ride in cold climates.
The trade-off is that sealed shoes can feel hot and stuffy in warmer weather. If you ride year-round in a place with real seasons, they'll likely be too warm for summer use. Some riders work around this by wearing overshoes on moderately ventilated shoes for winter, though dedicated sealed shoes will always provide better protection in harsh conditions.
Think of minimal ventilation shoes as your cold-weather specialist—they excel when keeping feet warm and dry matters most, but they're not meant to be your only pair if you also ride in the heat.