PE companies do it with very little regard for if any of the pieces are viable and survive after the fact, so their model isn't one I'd suggest following.
From a public policy perspective it doesn't matter if some pieces are unviable and fail to survive. Across the entire economy, this creative destruction allows for quickly reallocating resources to more productive uses. Most of the companies that take PE investments do so because they're badly managed and unable to obtain capital from other sources; they would likely fail anyway. At least the PE investment gives them a chance to survive and brings in more financially disciplined management.
There's many examples of companies who were conducting a low growth, long-term viable business. And where then PE stepped in, ripped out the most profitable part(s), and discarded the less-profitable parts as a dead husk.
In the process, the public lost the benefit that less-profitable part provided. Besides ripping up a company that was doing fine as-is.
You call that "reallocating resources to more productive uses". Yes that may be what's happening in some cases. But not always.
Less-profitable != non-beneficial to the public. At this point I regard PE entities as value-extraction machines. Which sometimes, but rarely, work with the public's benefit in mind.
And let's not get started on cases where PE secured loans, sold off a company's assets, only to lease them right back. Leaving company deprived of their assets & debt-laden, going under shortly after, while PE firm runs off with the goodies. Most people would think of that as theft & destruction. But in high-finance world it's named differently & somehow legal.
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