I don't know it this will be the case for Cuba, as it's somewhat differently placed on the map, but Russia tried DST only and had to switch to standard time and then stayed there.
Some people absolutely loves DST for some reason, but it creates stress and mental problems for people, especially in the north. The long mornings are somehow worse than the short evenings. Technically it shouldn't matter what the clock shows, but when society insists on things happening at a certain time, whether or not the sun is out becomes important.
For the Russian case see: https://www.bbc.com/news/blogs-news-from-elsewhere-28423647
> especially in the north
We don't care about the people living in the North, there are more of us living not in North and as we live in a democracy (the EU) the majority vote should cound on this.