Sorry I did not intend to come off as bashing your idea. I just felt it was pretty similar to what we have, and it would be less flexible in that you could not use support as needed. It's more flexible to be able to dps and switch to support as needed throughout an instance rather than stay 100% dps or. 100% support for the whole time.

While I think some might like your suggestion, I think it takes away the ability to support as needed, rather than support to support even when you might only need support on 1 boss out of 4.