I'm actually ok with this. I'd be ok if the turtle egg was also tied to strikes. You have control over who you're playing with in strikes.
Locking the turtle behind this open world meta is bad for a lot of different reasons but at the end of the day it's going to be bad for the game as a whole.
Think about how many new people will be coming to the game. A brand new expansion just dropped. Anet packages in a level 80 character boost.
People will 100% boost their characters with that and end up at this meta. They've probably been sold on the game watching adverts and hearing about how wonderful the GW2 community is.
They get to this map(doesn't even need to be the event) and they see people being abusive to each other in map chat. I've seen people get torn down for asking what CC is after an event fail. Maybe they were trolling, maybe they were legitimately asking. I know I was too frustrated to answer but the people that did were mostly mean.
Even people who are normally super chill and helpful(myself included) are frustrated to the point of taking a break or writing the possibility of getting the turtle off all together.