I’ve come to Nero this post as is it still relevant. I do not Mythic raid or lead the pack in the highest of M+. What I do is enjoy or suffer from whatever pvp design and tuning imbalance exists. Lately the former as I have been willing to reroll off of Ret in early Dragonflight.
Pvp perspective. I’ve played Ret as a main many expansions but not TWW, but I have tested it on Beta some and fought against it in pvp often enough to have opinions on its performance.
Some Ret players are able to perform to a mediocre level, even though design and tuning currently does not favor Ret at all.
The main reasons I cannot consider playing Ret are.
It is tuned to output much less damage, healing, and has less effective CCs compared to other specs. That matters in pvp as it is not a team effort Vs AI normally, facing better tuned and designed to do the pvp job specs as a choice would be handicapping myself.
The design disparity comes from others having what Ret lacks like, MS, Knockbacks, Disarms, Instant mobility, multiple CCs that dont instantly break to damage, multiple CCs that don’t cleanses enemies DoTs, Multiple CCs that are instant cast, invisability, area denial, silences, dispells.
Specs that are not a Paladin also do not have Forbearance, a punishment for using a defensive. This is a problem because Rets main defensives are long cooldowns removed early by short cooldown dispells. A otherwise good defensive removed early from a dispell cannot be replaced with another due to Forbearance until a while after the Ret is dead.
A unique to Paladin issue remains where if anyone receives a BoP from a paladin, the same paladin cannot Blessing of Spellwarding anyone for 4 or 5 minutes, and a thematically incorrect problem exists where BoP can remove or prevent physical stuns, but its magical counterpart Blessing of Spellwarding wards 0 spells that are CC. Even if BoS lack of interaction with magical CC is intended, it makes no sense to have that be intended.
Lastly, paladin as a whole class has WoG tuned very poorly in pvp, and it costing both holy power and mana is a feel bad situation every time it is pressed. WoGs shortcomings are not reduced by using Flash of light instead. There are no talent combinations that make FoL or WoG heal for adequate amounts.
With all of these design shortcomings, while Ret is also tuned less than favorable to do damage, I cannot consider playing the spec in PVP.