you're right that it would be more fair to keep AMT, but that's only because of the complexity of the tax code with all of its deductions and loopholes.
but i disagree that the tax plan is not designed to be dstructive. the bill is tax gerrymandering at it's finest--designed primarily to boost the republican party, it's cronies, and especcially trump himself, while punishing all others, including the poor and powerless. it saddles the federal government with massive debt while providing tax breaks to those who least need it. there is simply no intent anywhere in this "tax reform" to actually improve our economy through good policy; it's rather designed to achieve purely political aims, destructiveness be damned.
but more to the point, the proposed 409b section is about restricting when we can recognize income for tax purposes. while fictitious corporate "persons" are allowed to shift income and losses at will forward and backward along the timeline to avoid taxes, we humans, i.e. real people, cannot. this is simply the exact opposite of how the system should be designed. we should favor real people over fake people (especially over fake entities designed solely to completely shield already-advantaged owners from their failings and mistakes).
even better, let's entirely remove the ability to move income and loss recognition through time for tax purposes. it's simpler and less prone to gamesmanship (i know that's more complicated than it sounds, but it's surely much less complicated than the current rules).