LLC's are kind of odd. You can select how you want them taxed. A multi-member LLC can be taxed as a corporation or as a partnership. This is entirely up to the members.
You should still get an EIN for the LLC since you will want to report revenue against it as well as sales taxes. I am kind of shocked that the IRS would say that.
If you are a multi-member LLC, taxed as a partnership, you will generate Schedule K-1's for your members. These profits or losses will be passed through to your partners as a percentage of what they own and they pay personal income tax on it.
The benefits of a partnership status is that you don't have to pay corporate tax -- you just pay personal tax. If you are taxed as a corporation, you pay both corporate and personal taxes if you take money out of the LLC. It really does depend on when you distribute the profits or losses.
There are reasons, which an accountant will know, to switch. Usually it has to do with minimum taxes and how much revenue or profit you make.