I don’t think it even occurred to me to ask if our venue had wifi. Out of habit if I’m going somewhere as a visitor I’ll check to see if there’s wifi, but it’s not a problem if there isn’t. I certainly wouldn’t call it a dealbreaker.
All my friends generally use cellular, but someone recently mentioned to me that many people use wifi instead of cellular, so that may be a little concerned about the lack of wifi at the venue.
As far as guests, wifi shouldn't matter. The only issue that may come up is if you have a DJ that uses it with an online storage for music. I don't know how they operate so maybe just double check!
I think it'll be fine and you shouldn't concern yourself with it. My FH and I's venue does not provide wifi either and I love that. For those who have unlimited data, they'll be fine, but for our guests who may not, it'll force them to keep their phones away and enjoy the day with my FH and I.
I’ve never considered even seeking out WiFi at a wedding. I can’t imagine feeling the need for it.
For what it’s worth, our wedding was at a private home. The concept of WiFi never came up. Not a single vendor asked about it, and we didn’t give the password to anyone. All went swimmingly, everyone enjoyed their time!
Our venue had the WORST wifi and no cell service. It didn't change anything. We did alert people on our website & details card though just so they knew for GPS.