It’s a mixed batch as to how they felt about going to college at that early age. Academically, it was the clearly the best way to proceed. Socially, emotionally, I don’t think anyone knows what is the best answer. I think a lot more schools have dual enrollment programs now, so that kids can socially stay with their peers and still take the courses that match their level. My youngest two have friends who were taking mostly college course the last two years of high school. Those kids went off to Harvard, Columbia
and Yale, perhaps a year earlier than usual, age wise, but they were very much in step with their peers the entire time
My one son had second semester sophomore standing in terms of college credits when he started college. But he went into a major that still required 4 years. He was able to take course in great depth in his area of study as he had all of the general education requirements out of the way.
The “amazing” kids that started a lot of social media and are this generation’s giants —a number of them lived in our area, some went to school with my kids. They went to college at the regular age, the most selective schools, when they could have easily gone to college years before they did.