[shiroiushi]

>1. and 2. are anti-business. Just like raising the minimum wage, passing anti-business legislation is very, very difficult.

Sure, I'll agree to that.

>3. well, if there aren't any negatives, why is there currently a limit on the number of visas?

That's a good question, and I have no idea what the answer is. If anti-business legislation (like #1 and #2 here) is so hard to pass, then it seemingly shouldn't be that hard to pass pro-business legislation. Increasing the number of visas (or eliminating the limit) should, logically, be a pro-business position (lots more workers), while also being of interest to the left-leaning people who generally claim to be pro-immigration. So WTF is the problem? I don't know. The only people who should be opposed to such a move are 1) the outright anti-any-kind-of-immigration racists on the right (who aren't even a sizeable number, a large portion (most?) of the anti-immigration people are usually against illegal and/or low-skilled immigration), and 2) any firms that are profiting off the shortage of visas.

>directly contradicting the OP's implication that they are simple and easy.

I don't think the OP was under any illusion that passing such legislation would be simple and easy, due to the hyper-partisan nature of the current government. If the government weren't this way, passing reforms would be easy.