[antichronology]

Its possible that its better to leave the option more inaccessible to further incentivize yourself from reverting back to color mode. Maybe those few extra steps of converting back to color will stop you from doing so

[graeme]

Agreed. But, in my case I couldn't use grayscale without this. I need colour many times a day for work.

So, this is actually what made greyscale possibly at all. I do agree you have to watch for leaving it off though.

If you find yourself switching it off you can set a daily reminder until the habit sticks.