The encapsulation/third party grading came about for the obvious reason of taking out the second guessing between 2 parties. If you like owing raw books, then you can only collect raw books, or buy encapsulated books and crack them out.
If you want to re-sell the books, then a 3rd party encapsulation will probably help you sell for a maximum price.
I am of the opinion that CGC has gotten log jammed, with too many, mid grade/non-key books that don't warrant a 3rd party system. If you want to argue about some random Bronze age being a 4.0 or 5.0, then have at it. I gots more important things to do.