It all depends. Give us a better scenario and we can give you a better answer.

I think the key word you used would be 'expirement'. Hopefully in a safe manner.

Disadvantages - limited options. If it turns colder than expected, what are you going to do? Where do you like to keep your stuff? What's the weather going to be like? What other gear are you carrying?

For the weight of a good bivy, you can carry a TarpTent and have room to spread out and be protected. Similar with a tarp.

If it were a truly effective option, then I'm sure we would have more examples of it being used. Not to say that it's not an option, but it wouldn't be for me (except in an emergency).

You can do as you please, but me and my old bones will hang from the trees.