There is a fine line between hard and dropping tactical nukes at the slightest provocation.
Also, at least the lab event seems to have been a unforeseen consequence of seemingly unrelated changes.
Change 1, general buffing of krait.
This change also most various late game story missions virtually impossible to complete for non-bust builds and professions. This because they had a krait boss with a summon ability.
Change 2, changes to event scaling to include more difficult mobs rather than just pile on more and more trash mobs.
This resulted in veterans and eventually champions spawning. Thing is that we do not know exactly how the event scaling works so we can’t say how it decides that someone is taking part in the event or not. And the lab area is a dragon fight staging ground and so leads to masses of people gathering.
These two changes, on the surface seemingly unrelated, come together in this single event to create a situation, where you quickly find yourself facing down multiple buffed krait in champion form.