I think everyone has a different opinion on “cheat” days and what that means, and what it could do to a Keto lifestyle.
I, for one, would never tell anyone to cheat or not to cheat. None of my business. If people want to plan it, or slip up, or say cheat, or whatever, then Yay!!! good for them.
I have been Keto since January 2 of this year, and I just don’t have any desire to have carbs or sugary things anymore. I look at them like poison for me. Yuck, don’t want it, thank you. Now, have I “cheated” with too much Keto food? probably - one too many fat bombs, maybe too much cheese, extra wine, etc. So, that is maybe my “cheat”. But as far as planning a carb up day, or reserving a day for sugary foods, or anything like that, I just don’t have the desire anymore for that stuff. It’s not discipline either, it’s just not appealing.
I did hear on one of the many podcasts I listen to I did hear that once you re-introduce carbs, it could take about 5 days to get fat adapted again. So, you could carb up on Saturday, and not get back into fat adaptation again until Thursday. This assumes you were humming along fat adapted to begin with. So, again, not worth it for me.