In the context of hotel buffet food service waste, it definitely is.

And if what you’re really trying to say is that you like intermittent fasting (which can have eating windows at any part of the day even if the meme is to start eating at traditional lunch hours) the first meal, that meal which breaks your fast, is, by definition, breakfast. This could be your only meal if taking intermittent fasting to its extreme - further evidence for it being most important.

The other way in which breakfast is most important, IMO, is that it sets the tone for the rest of the day. To be more specific, the first meal that gets you onto the blood sugar/insulin rollercoaster will keep you on the rollercoaster all day until you fast again - so the quality of your meals (aka not starting your day with sugar bombs) is highly important.

Regardless, “important” is purely an opinion/values statement; the only error is claiming that a sincerely held opinion is an “error”.

Edit: after some recent travel experiences, I found that starting my day with a high quality salad (little dressing, whole fish, variety of vegetables, small portion) was transformative in keeping my blood sugar under control, maintaining stable energy level, and promoting healthy digestion.