What you propose is straightforward.
Most set power is known due to the set leaderboards. Season 23 leaderboards is a great place to see set power for lower paragon players.
I already organized it for DH. (500 key clears for experienced players):
The more challenging data to gather is the current strength of unused skills. I bring this up because I believe this is really what people want addressed in combination with set buffs.
Tackling it involves play testing and open discussion to reveal the pain points (because the gameplay should be satisfying).
For DH and Crusader I could probably produce another chart with all of the skills ranked by GR @ 5kp fairly quickly. If devs need to know this, they should just openly ask for it. I am positive the community would be extremely cooperative.
This is not so straightforward. Take UE6 for instance, currently the frontrunner skill is Hungering Arrow. So we match this to M6 and now the GoD6 set is no longer the champion for generators. I believe the correct solution is to address the set bonuses and select legendary items.
On a side note, at this very moment in time I believe more is needed than set/skill balance to win back players who left to Lost Ark.
- A new mode of play (Something other than GR)
- Additional item chase (Ethereal, Mythic, Epic, etc)
- Set/Skill balance
- Paragon rework, with greater diminishing returns on main stat investment
- Follower expansion, letting them use LoN/LoD and gearing them for damage, allowing them to take the place of a player in 2 and 3 player group
- Legendary item tuning
- Legendary gem revamps
- Augments that offer more than main stat
I’d even consider nerfing all sets to GR120, raising the gem cap to 300, and introducing a critical gem up system that always grants +2 ranks at 100% chance, with a smaller chance to +2 as the success rate is reduced.