Of course I cannot speak for everyone with ADHD but for me the focus issue generally extends even to typical procrastination behaviour for I can't consistently

Of course I cannot speak for everyone with ADHD but for me the focus issue generally extends even to typical procrastination behaviour for I can't consistently focus on things that are fun and harmless, like reading a novel (currently The Expanse) or watching a Netflix show or physical activities (BJJ). I think that ingrained bad habits are only the top layer in a life with ADHD.