Omg yes! They almost HAD to have wi-fi. Just imagine the muggleborns already feeling like outsiders, and coming to this new school, leaving all their friends behind, all the things they had in the muggle world, just to learn magic. Dumbledore probably gave them wi-fi so they wouldn't feel totally isolated from the world they grew up in for the last 10 years.
How To Trick People Into Thinking You’re Tech Savvy
Create a QR with your wifi password on it for when guests/friends come over and want to use your internet. Instead of awkwardly trying to talk people through it, simply have them scan the code and get browsing.