In high school, I think it depends on the size of the field. Fields that are 305 down the line and 345-350 in dead center, and 330 in the gap still have homeruns hit out by kids with some power.
But the fields that are 320 down the line, 345-350 in the gaps, and 380 in center are not seeing home runs. The high schools in my area have three or four fields that are short porches like I described above. Two play on the deep-type fields. All the others are similar to the deep fields down the line and in the gap but only go to about 360 in center.
There are homeruns hit on the short fields, but very few, if any on the others. And, of course, most college fields are deeper than the deep field I described above.