skirmishers should be a sub class of fighter instead of being grouped in with assassins
the only reason i think, they were grouped in with assassins, is because someone felt the need to give every major class exactly two sub classes, when the champions were recategorized.
but realistically skirmishers feel like a third, more squishy/high dps sub class of fighters, than playing even close to the more bursty/stealthy assassins. the only exception being ekko, and riven, who can be exceptionally bursty even for skirmishers and depending on the situation build fit into either category.
then again, even darius and illaoi can be bursty given the right circumstances.

these guys just tend to excell at extended fights/duels, which is more of an attribute of fighters imo.