I was just thinking a similar thing yesterday, while doing some regression play. My little is older than most, between 9-12 years old, and I'm not really into "baby" stuff.
But I was in little mode, hanging around outside "playing" with the hose as I watered the lawn. Little 9 year old me had wanted to go potty, but wet his pants instead, and I was just enjoying the experience and thinking about how nice it would be to be an actual kid again.
But it dawned on me that it probably wouldn't be so great. I really don't think I'd like to experience my whole childhood again. Not because it was terrible, but just because I wouldn't want to have to be completely reliant on others to take care of me and tell me what to do all the time.
As I was walking around in my wet pants, I was thinking about the accidents I used to have back then, as well as other, non accident related things, like playing with my friends.
I decided that I don't actually miss my childhood, just certain aspects of it. I miss making plans with my friends, then carrying them out. When your a kid, that's as far as you think ahead. What, when and how your next adventure is going to be. While you're playing, you're not even thinking ahead about school tomorrow or anything, you're just living in the moment.
Nowadays, as a grown up, I'm free to travel and holiday as much as my budget can allow, but I can never just live in the moment like I did as a kid. I can be overseas, in a nice villa,sitting around my private pool, drinking a cocktail and relaxing. But I'm always thinking in the back of my mind about grown up problems. What's happening at work, have I budgeted enough money, how much time do I need to get to the airport?
There's always something to worry about, even if it's minor. Kids don't. They just exist for the moment. That's what I miss.
With the wetting side, I miss being told that it's okay when I've had an accident. I miss being diapered before going to bed, and then being asked the next day if I'm wet or not, and just being accepted regardless of the answer. I miss being told that it's okay to wee in my underpants while I play with the hose. Or being told not to pee in the pool, but to get out and pee in my shorts on the lawn instead.
So I guess I miss the lack of care and responsibilities I had as a child, but I wouldn't want to go through the whole dependency side of things again.