I don't see any mention of lawsuits resulting in the involvement of JPMorgan, only those filed afterwards. The story [0] makes it sound like Jo acquiesced to hiring an "independent" administrator, which seems to be a case of no good deed going unpunished.
So I stand by the idea that complications from (seemingly voluntarily) hiring a third party executor for $230k puts the situation squarely within "first world problems", meaning caused by out of touch affluence. A family with lesser means would have had to work it out for themselves, under the pointed threat of the entire estate being immediately consumed by legal expenses.
[0] Granted, the whole article is in terms of her side of the story.
Neither Jo nor the children wanted to negotiate. They forced each other to have a third party and they fought until there was nothing left to inherit.
A family with lesser means would ruin themselves with a cheaper executor. It's really common.