I don't think you know what you're talking about. An engineer making $200k+ at a FAANG can leave that company and.... probably make the same (or more) at another large tech company. Their salary is determined by basic supply & demand, if they have skills worth $200+ at one company, they'll find similar compensation elsewhere. (If it's not easy to justify their salary at a new company- why exactly is their current company paying them that much? Are they running a charity or something?)
I don't understand your obsession with payroll taxes. I'm self-employed too, everyone knows you avoid payroll or self-employment taxes by setting up an S Corp and paying yourself disbursements on top of a salary. Anyways, for an employee they're really not extremely high, so I don't understand building a whole strategy just to avoid this 6% tax. Being a FAANG employee comes with a ton of non-cash benefits & perks- the 401k match alone is probably double whatever you're losing in payroll taxes. The value of the health insurance is probably more than payroll taxes.... Sounds like you're not really properly accounting for any of this