The public does see the party as personality in many ways.  Some like the details of governing, but most vote for what they see as the character type of The Party.

That may always be the reality no matter how much transparency we expect.   The Party spends billions promoting their image.   And it works. Its proffesional advertising.

The parties compete for special interests donations and you can be sure those special interest expect a return.   At a minimum it gives them unequal access over less mmmm profitable interest.