Yes, rocky soil is a plus in that situation. Use that heavy rain as a guide to see how heavy rain runoff flows in your yard to ensure that proper grading and drainage is accomplished. Nothing will sour the experience like a pool that floods. We had about 4" and if I didn't have a rain gauge (or pool) I wouldn't have known it rained. I have had to tweak a few things but at least they got 95% of it right.Here is a picture of the recent storm we had in MD. Fortunately it didn’t affect much.
Community pools and days of hanging out are great for teaching social skills to kids, routine adult conversations, and many other reasons. But private pools have many positives too. And yes, water quality is at the top of that positives list.