I've used FSD a lot. Supervising it is a skill that you actively develop and can get very good at. Some argue that if you have to supervise it, there's no point, but I disagree. I still use it for much of my daily commute even though I have to supervise it and occasionally intervene. It's still a significant net positive addition to the driving experience for me overall. I would legitimately consider using it a skill that improves with practice; there's a threshold of skill where it becomes a huge positive, but below that threshold it can be a negative.