All these assume that the ambient temperature outside will be lower than the temperature in your home, hence you want the air to come in but keep the sun out.

In southern Europe this is false for many weeks during the summer. During heatwaves you want to open all the windows during the night, and close everything at 9ish-10. Because the temperature outside is going to rise to 40-45 celsius the ambient air will only heat your house, even drafts will feel burning hot. So not just shutters, but glass windows and curtains too,

Then about 8 hours later, you want to open everything back up and wash your balcony or terrace (evaporative cooling it essentially), you want to use a minimum amount of water, that will evaporate in the next 30-40 minutes because it attracts mosquitos.

But overall air conditioning is the way to go.