Lol I never got this.
Most continental breakfasts I’ve seen run from 6-9AM and I’ve always interpreted it as a sneaky tactic hotels use to usher guests quickly out the door given that standard checkout time is usually 11AM.
Honestly it’s never worth it.
Maybe I’m in a fortunate position. But I have never been to a place where breakfast was as good as an average cafe.
From my experience: If Hotel A and Hotel B were pretty identical the same but for $20 more, you get all you can eat breakfast, don’t bother. Just buy breakfast.