Ok gosh lots of info... I admit I had to get into the right frame of mind to answer, at first I took the info a little like a personal attack hinting that I'd rather cut corners than care for my fish. After thinking I realize it's just input to what is successful for you, and I appreciate it. I might even steal some ideas! haha
To start I hope I didn't misrepresent. Yes I used to keep my past bettas in smaller square betta tanks (and they were happy and lived long, I just got tired of cleaning them so often), but I have for CJ a rectangular 1.5 gallon tank with a filter and a light which keeps the water a consistent warm temperature and clean. I do not give him a 360 view, it's next to a wall. He does have a territory he likes best which is under the filter. I planted two tiny betta live plants on the bottom which seem to be growing well and placed one larger silk plant that he can swim all through in there as well. He seems comfortable and content, to be honest; never looks bored, enjoys exploring the bottom and making his little bubble nests all the time at the top. As for changing water, about once every two weeks I take out about a third of his water and replace it just so he has fresh water (not because it's dirty, the filter is great!) and he does not get stressed at all. I know what stress is by the complete water changes I had to do in the past with the smaller tanks. And to be clear, it is a regular rectangular tank, not a vase and not a bowl.
So I think I've succeeded in providing him with your 5 requirements!
And I promise no matter how fascinating I found the history, I do not plan to keep him in a puddle or did you say wet leaf?
Thanks for the feedback, it's fun to talk to other betta lovers.