The guitar is a complex instrument - even more complex than a piano keyboard. It is also deceptive - using styles (word chosen carefully for semantic reasons!) such as a capo base style limit one related as to what possibilities are available on the instrument due to its design & structure. You could replace 'style' with 'philosophy' to help you think of what meaning I intend. :-)

You see, with a capo, you are restricted to a cycle of relative chord positions that are always the same, no matter what relative pitch they are started in. It's sorta like dropping a frame over a piano keyboard, and you can only use what chord structures the frame allows - using an unrestricted (non-capo) style is like removing the frame from the keyboard, allowing an almost infinite (within the total limited universe the guitar provides) selection of chordal structure. Actually it's a bit like - for slightly different reasons - an autoharp - but which has a different philosophy in its design and construction

"Folkie styles" are always restricted in concept - by intentional design - if you move outside this structure, you get different things - of course... :-)