I used a kiddie pool for Charlie when he was smaller too. We didn't have a fenced yard at the time so it gave him some sun exposure while keeping him contained.I was on the time a member posted on the forum wanting to know if her tortoise was dying at that exact moment. The tortoise had his head squished between a doorjamb. Members had to talk her through testing to see whether it was dead or alive. It was sadly losing brain activity while she was typing. When you love an animal, that kind of stuff sticks with you and I couldn't help but imagine what if I were in the poster's place.
That being said, we HAVE ALWAYS taken our tortoise out of her enclosure to interact with her. There are safer ways that minimize risk. We have kept a kiddie pool for this exact reason. Even under these circumstances, I give constant supervision because I have a house full of animals. The cats were really interested in our tortoise when she was small.
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(photo taken in 2014)
I never considered letting him roam around inside the house. Besides the mess, it would be too easy to forget he was there and step on him.