Earlier quoted context omitted.
The main goal with the “hire children” discussions I’ve seen is to lodge taxable income to the child so you can start investment/retirement accounts. But there are other ways to do the same thing.
One problem with this is that we have no idea what the tax code will look like in 50+ years, when the kid is pulling money out. It’s quite possible that Roth accounts (which are funded with post tax contributions) will no longer be tax free for withdrawals, for example. I could easily see this being walked back for high-income folks, as a way to pay off the enormous debt we are currently incurring.
You can never predict all future tax changes, but you can be more flexible by having multiple different "stacks" that you can utilize when you want.