Hero limits should have been implemented by now, but Blizzard says it's pushed this back due to "overwhelming demand". However, many fans are begging for hero limits to be introduced,

Throughout the years, the Overwatch community has experienced many shifts, from the unbridled excitement of the post-launch period to the drudgery of the enduring GOATs meta, followed by renewed hope at the announcement of Overwatch 2, and confusion when the ‘sequel’ launched. It’s been anything but a smooth ride for fans.

Overwatch Classic turns back the clock on Overwatch 2's updates to the meta, and players should look out for one common mistake when using D.Va's Ult.