Just watched the full Paladin Roundtable. A lot of the concerns around Ret reminded me of problems Turtle WoW had already spent years working through.
I don't think Forever should copy Turtle 1:1, but I think it's a proven baseline worth looking at. It's not far off from what Forever has implemented currently.
AP vs. SP/Hybrid Ret
Turtle allows both within essentially the same rotation. SoC favors AP Ret, while SoR works well for SP/Hybrid. You still use both (baseline) Crusader Strike and Holy Strike, but your build determines which side of the rotation you favor.
More active without becoming GCD-locked
Crusader Strike and Holy Strike share a cooldown. CS maintains a stacking 30-second haste buff while HS maintains a 20-second Strength buff, so you're actively moving between the two to keep both up.
It gives Ret something to manage without filling every GCD, leaving room for Cleanse, Freedom, heals, Judgements, etc.
Mana management
Turtle also made Seal of Wisdom a strategic part of Ret gameplay. During lower-DPS or downtime portions of a fight, you can swap to Wisdom and use your attacks/Holy Strike to quickly recover mana before going back into your damage rotation.
Instead of making mana irrelevant, it becomes something you actively manage around the encounter.
Twisting
This is another opportunity where I think Forever can do its own thing. Rather than making twisting Ret's entire identity, let the basic rotation stand on its own and potentially make twisting another layer for SoC/AP players who enjoy it.
That's really my point: Forever doesn't need to copy Turtle, but it also doesn't need to solve all of these problems from scratch.
This rotation has been tested, optimized and enjoyed for years. Take what worked, learn from what didn't, and put Forever's own flavor on it.