Distractions - you can't talk about the issues can you? Learning from your Messiah, Barack Hussein Obama?
But okay dude, allow me to explain this to you with simple math, since you're apparently too dense to use your own mind:
Annual Income $50,000
Addition to HSA $5,000
Medical Expenses $5,000
Non-Medical Spending $45,000
Now say that the government decides to stop allowing you to use your HSA for all medical expenses; now you can only use your HSA for half of your medical expenses. Your point is that your tax bill won't change if you'll continue putting $5,000 into your HSA, which is true. But now you have $2,500 in additional medical expenses that are not tax deductible and thus will have to come out of your regular $45,000 income. That means that in order to keep your tax bill the same, you'll have to spend less on other things OR save less (outside of your HSA) in order to be able to afford that $2,500 in non-deductible medical expenses. So either way the tax change takes a bite out of your budget.
Annual Income $50,000
Addition to HSA $5,000
HSA Medical Expenses $2,500
Non-HSA Medical Expenses $2,500
Non-Medical Spending $42,500