I don't think it's necessary. It is tradition for coffee to be available when the cake is served but it's personal preference if you think you should have it. My FH and I have opted to do a hot chocolate and coffee bar at our wedding, but we are doing it ourselves and not through our caterer. We're doing it b/c my FSIL got married last year and she didn't have coffee at her wedding and my FH's grandmother is still complaining about it. We just don't want to hear about it for the next how-ever many years from his grandma., lol. If you're for tradition and if it's in your budget, I'd say go for it. But if you don't think it's necessary, there's nothing wrong with not having it. I don't think I've ever been to a wedding where it was offered.
Definitely not! We’re having one just because it’s included in the package, but the past 2 weddings I’ve attended I’ve barely seen anyone actually want the coffee when offered to them with cake. Most of the time I’ll see someone at my table say yes and then just leave it there and go to the open bar instead
There’s a distinction between a coffee BAR and coffee service. An elaborate bar with options is absolutely not necessary. But I do think the option for a cup of coffee is fairly standard with dessert, and is helpful after people have been drinking, for them to mellow out & sober up before heading home. (I’ve never been to a wedding where coffee wasn’t served/available after dinner, but I also don’t think I’ve been to a wedding with a coffee bar type set up)