IDK about it being a standard private equity tactic, but as general rule, when a company is taken private, you have many fewer reporting requirements and a much lower level of scrutiny from public regulators. My impression is that this does indeed give you a freer hand in how you manage the business.
As to the rest, private equity, sometimes referred to as vulture capitalists, will often make the sort of decisions you noted in an effort to increase the value of the parts of the business that remain after restructuring while at the same time cashing in on less profitable aspects of the business by selling them off.