You are asking a lot of the word often here. Also, the perspective of who it is healthy for is skewed according to the data out there on outcomes after divorce.

Some people are better off after a divorce.

Most people are ruined financially by it. If you are a pro baseball player or Hollywood actor you can afford to lose half your wealth and support two households. People in the bottom 80% can’t afford it.

In the way that an amputation is. Better make sure that limb was definitely gangrenous because a part of you will be gone forever.

That's really not the best analogy. More like a cancer: a part of you that shouldn't even be there to begin with.

Maybe for an annulment, but that’s very rarely the case for divorces entered into consensually.

It's not very rare at all. Much the opposite in fact.