You can bet that if the board of directors could show that unscrambling the omelet would result in greater shareholder value produced, it would suddenly be really easy to do...
[1] https://www.investors.dupont.com/news-and-media/press-releas...
"Should" needs some unpacking; there's a subjective value lurking inside.
Personally, i prefer economic incentives over coercion. My starting point: there is a degree to which society must govern entities within it.
https://mmt101.substack.com/p/an-explanation-of-why-taxes-do...
One doesn't want to create a 'snake sheds its skin' scenario where Meta (for example), stuffs all its liability in a spin-off, yet keeps the profits those actions accrued in the other entity.