Dom,
Just a reminder that "classic" lofi GTD uses paper lists for task/project management and one or more filing cabinets for reference material. As long as you design and implement a reasonable filing system and as long you are disciplined in the use of your filing system, you are good.
If you follow the same principles with your electronic GTD system, you should be fine. Therefore, OF for task/project management and one or more (keeping it reasonable of course!) apps to manage reference material seems entirely consistant with GTD principles.
Just a reminder that "classic" lofi GTD uses paper lists for task/project management and one or more filing cabinets for reference material. As long as you design and implement a reasonable filing system and as long you are disciplined in the use of your filing system, you are good.
If you follow the same principles with your electronic GTD system, you should be fine. Therefore, OF for task/project management and one or more (keeping it reasonable of course!) apps to manage reference material seems entirely consistant with GTD principles.