'Breakfast is the most important meal of the day' is marketing that originated with cereal companies, not nutrition science. Evidence on breakfast and weight, performance, or health is mixed. The honest answer: breakfast is fine if you want it; skipping is fine if you don't.
Where breakfast might help
Cognitive performance in children (modest evidence). Diabetics needing stable blood sugar. People who overeat later in the day if they skip morning food. Pregnant women managing nausea with frequent small meals.
Where skipping might help
Adults practising intermittent fasting (16:8 most common). Useful for some, no benefit over normal eating for others — depends on individual. Calorie management for some (extending overnight fast reduces eating window).
Eat breakfast if you're hungry; skip if not. Your body usually has a reasonable answer about whether you need it on any given day. The moral framing around either option is mostly marketing.