This is a pretty contentious topic. Irish Electric Car Facebook groups are fairly obsessive and militant about it.
Comes down to a combination of the charger type you're using and what car you're driving. My car can charge quicker and to a higher % than the Leaf in a fast charger. And it auto-disconnects when complete so someone can use it after me. So it's kind of ideal. Allows me to leave a fast charging car for a few mins without any concern that I'm screwing others in need of a charge. Becomes a problem for other cars that take longer to charge.
Dart station typically have slower chargers. They'd charge my car in about 4/5 hours from empty. Its OK to leave them charge but the problem comes when they are done charging. Like leaving a car there for 8 hours when it'd only be charging for the first 4 hours isnt great. But it depends on the location. I've left it charging in Dingle for a long time as I would be surprised if Dingle would be that busy. Dublin dart stations are a different stories. Also, in Dublin you're typically charged for parking while charging. If they wanted electric cars to properly take off they could look at things like making parking free in charging spots while charging and allowing EVs use bus lanes.