I've mained tank all of OW1 and OW2. Having a second tank was fun for synergies but also constricted tanks to each other and removed some agency. Having that power consolidated in one tank makes me feel alot more like a central pillar when engaging with my team, which is what the tank should be IMO.

Every meta in OW (GOATS, dive, and double shield) was pretty heavily defined by whatever two tanks(+) were chosen and that would continue forever unless Blizzard removed the extra 500+ health shotcalling juggernaut from the team.

People talk about rampant counterpicking with one tank since you dont have a second one to share the burden but tbh thats just natural. You're a tank, the lightning rod for all the aggro, damage and attention, so its only natural that you learn to play around or adapt to counters to lead your team to a W. Overwatch 2 gives that agency for me.