And you’re ignoring the point under discussion. The expressive event in which the object is to appear is a limiting principle to preclude what you allege but cannot show will occur, an Armageddon, world ending discrimination. (Not talking about cakes with symbols or words).
The bouquet is an integral part of a wedding, as are the bride's dress and bridemaid's dresses. The jewelry, possibly the biggest? Photographer is a pretty big deal. In fact, a wedding is nothing but a lot of critical things that are expensive and require skill and can be considered art... and subject to this "expression" crap argument. So most of the big cogs in a wedding can become an issue for a gay couple.
And if a gay couple is located in a rural Trump voting area, it becomes possible that a wedding isn't even possible now because services can be legally restricted from them. We've already been here with the Civil Rights movement (the interstate commerce argument). The only difference here is that SCOTUS appears willing to pretend that homosexuality is a "choice", where as race isn't a choice.
In general, the Supreme Court has been more likely to expand rights than to restrict them, but in this case, they'd be expanding the rights of individuals to discriminate and reduce the rights of gays. You seem to think this isn't that big of a deal because it is 'just weddings', but this will be used to game the system.
Breyer made the distinction between artist and artisan in the hearing. What the baker makes is definitely wonderful and nice, but this idea that it is "expression" is a lie. The cake expresses the ideal of beautiful or abstract or whatever
the couple wants. No gives a rat's butt what the baker thinks about the wedding, it is just about the cake. No one sees to the cake for the baker's expression.