The spec is performing terribly/not being brought for high end content right now.
First, looking at raiding, here is the Resto Druid representation by fight for the last 5 bosses of Mythic CN:
Darkvein - 3% (Disc 34%, Pally 33%, Shaman 27%)
Council - 4% (Shaman 41%, Disc 26%, Pally 24%)
Sludgefist - 5% (Shaman 36%, Disc 33%, Pally 24%)
Stone Legion - 5% (Shaman 42%, Pally 28%, Disc 21%)
Sire - 2% (Pally 39%, Shaman 31%, Disc 26%)
The trend here is unmistakable - Druids have about 1/10 of the representation of Shaman, Paladins and Priests in high end Mythic healing comps. Even on 5 healer fights like Sludgefist, Council, and Stone Legion, the spec is only getting 5% of representation, suggesting they are only being brought like 25% of the time. It’s a big problem that speaks the the overall weakness of the Resto Druid toolkit or at least the fact that it doesn’t hold up to the toolkit of the top 3 healers. You can see from HPS/throughput numbers, all specs are pretty even, but Druids and Monks are just being outright shut out of comps, because if you are only at best able to do the same healing as a spec with significant unique toolkit/utility, you have no value to a raid.
Then, we can turn to Mythic+. Resto Druid M+ strength was often quoted in BfA as a reason why the spec needs to be lackluster in raids. However, the data in Shadowlands shows that M+ is no longer a RDruid strength. The WCL points data puts Resto Druids as the 4th best M+ healer (behind the familiar Disc/Paladin/Shaman triumvirate). Raider IO leaderboards suggest the exact same thing - there are only 2 Resto Druids present in the top 100 M+ runs, with Shaman especially dominating, but Paladins and Priests much more represented.
How is it reasonable for the spec to be weaker in all PvE aspects of the game than the 3 top specs, and to see 2%-5% role representation in high end content when the 3 main specs are seeing 25-40%? At what point can we expect to see some fairness and class balance go out to address these egregious issues?