No. Wedding cakes are part of the tradition after the ceremony. You’re married without the cake.
Some people don’t even have cake.
The reception is a tradition that some people participate in, but not everyone has a reception, either.
Not sure why this is even a “thing” for you. By definition, a “wedding” cake is directly related to the “wedding.”
My point: Providing food (sandwiches) to people who are engaging in systematic immoral behavior ... is different from providing food (a wedding cake) that is an integral symbolic element in a gay “wedding” celebration. The gay couple cuts the cake and feeds it to each other as part of the ceremony, right? It’s a ceremonious activity, an important symbolic element of some wedding ceremonies.
My point: CFA did well to just serve the sandwiches to the baby killers. And the baker did just fine by choosing *not* to participate in a gay “wedding” by not providing a wedding cake for a gay couple ...