That’s sort of like the question (in dentistry) “Do I really need to floss?” You know the answer ….Only the teeth you want to keep!!
Originally, Facebook was only for making connections, not for business, hence Profile pages. It was a profile of you, your personal information, likes and dislikes.
Then businesses began to see the power Facebook held and started creating Profile pages for their businesses (which is actually against Facebook rules). So in true Facebook fashion…Facebook started making changes (imagine that!) and created the Business page portion of Facebook.
Profile pages are very limited as to what can and can’t be done as far as a business is concerned. The most noticeable being viewers have to wait to be confirmed after sending a “friend request”.
To see how the two differ let’s look at PROFILE -vs- BUSINESS this way:
Your PROFILE page is really a personal page (and not to be used as a business per FB). It’s like your home. If someone comes to your door at home, they knock on your door and have to wait to be let in.