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Not necessarily. For some it might require a redesign of their restaurant / breakfast area.. And it'd be complicated for ones who want to discriminate against HHonors members (giving them only access the "continental" part of the breakfast buffet during pre-Covid times), because it would require checking ID's/names/something.

So it's much simpler for hotels that give the same breakfast to everyone, like a Hampton, than for DoubleTree's, FS Hiltons, etc.

And other brands need other solutions. You can't get a cooked-to-order breakfast in the same way at an HGI that you get a buffet-served-to-you breakfast at a Hampton.

At an HGI, the solution would be to place an order, get it a few minutes later in a bag, and take it back to your room. But that's still a different solution, and points out the need for different solutions at different brands that do breakfast differently.