devtrackers.gg
Wasn't there a change to Melee awhile back that basically gave (most) Melee based skills a mini cone that could hit however many enemies within that cone?
Yes that was in 3.7.0 (alongside Legion league), and was the introduction of strike skills.
The reason "Strike" exists as a gem tag is because we could no longer identify that set of skills as "single-target melee attacks" because they hit multiple targets.