The main issue is attempting to do anything which isn't the zombie infestation becomes hard to perform, mainly because player zombies like to wow gold classic hangout at quest givers and other spots where plenty of players have a tendency to gather. Since this event also will come with an entire questline that occurs in the zones around Stormwind and Orgrimmar, there's ample opportunity to camp out and potentially infect as many players as possible. However, one positive change from the last time the zombie infestation occurred is that Blizzard seems to have made it more challenging to spread it into the rest of Azeroth. Among the first things I did once I got infected was to hearth to Dalaran, but when I arrived, I wasn't infected anymore. However, I was able to take it to Boralus via utilizing the portal site in the mage tower, so it's not a perfect system yet.
The main thing to understand is two distinct events are moving on. There's the scourge invasion as well as the questline, that takes players to Icecrown and sends gamers on a goose hunt for Nathanos. Then there's the zombie infestation, which adds a small PvP aspect for everything. It isn't surprising a few folks would want to get involved in the very first event but not the second, as not everyone enjoys PvP or using their class and race skills removed and replaced by additional abilities. Blizzard could produce the infestation only active for one of the months of cheap classic wow gold the invasion, but that is no fun for anybody who misses that week and might want to engage. An infestation is essentially a PvP event , so having the capability to opt-in with Warmode makes sense. Even doing something where for most of the invasion, players had to opt in the infestation by choosing Warmode, but at the previous week, even until Shadowlands dropped, the infestation could influence everyone, would most likely be the optimal solution.