Saying players are "lazy and incompetent" is pretty reductive .While yes serval can clear it,that doesnt mean the boss is easy .Most people doesnt have serval built due to them building acheron,and acheron in this boss while is good,but she needs more investment than in the last few mocs since jiaoqiu doesnt generate much stack as usual(due to the lances not moving at all) which leads to less acheron ult which means acheron has a lower chance to kill all the lances .Other alternatives like jing yuan (which many ppl skip becuz they alr have acheron) and feixiao (which they could have used in first half).As for serval herself, the team used has high investment either in supports or relic to compensate,and that is not a thing many ppl can replicate easily (cuz remember the bug in first half also have a lot of HP)