The upcoming skill gem rework comes with some partial flaws in design- mainly quality dependant

Moving Helmet enchants to skill gem quality is a mistake.
Original alt quality skill gems already suffered from an uprise in quality stacking vie specific unique items, crafts and to some extent enhance support gem.
As a consequence the potency of many alternate quality skill gems has been drastically reduced a while later to reduce the desire of stacking gem quality to very high values.

Not only is this mistake about to be made again, there is also a huge discrepancy in the potency of new qualities and how much they add to the skills power.
Let's take Tornado Shot and Lightning Strike as a quick example. Because of it's strength, the numerical value in TS's enchantment has been reduced in a past patch from +2 secondary projectiles to just +1. Even after that change and before TS gained more popularity through bow skill buffs, this specific enchantment kept high trade value because of it's inherent strength.
Then you have Lightning Strike's new quality- a measly +1 projectile, all while the enchantment offered the choice between +2 projectiles or 3 pierce.

Not only differ the changes in quality effects vehemently in strength for their parent skill, some strong qualities can now be scaled to absurd values.
That issue is not exclusive to the two mentioned skills and can be observed through many others.
To top it all off- some new qualities used to be already available as an alternate quality and as a result not only lose access to their former enchantment but also to the other available alternate qualities, reducing diversity as a consequence.
One example for this is Ethereal Knives. It now receives the quality effect from anomalous EK while losing access to it's divergent version for Impale and it's helmet enchant to fire projectiles in a circle. Both of which changed how this skill behaved and had to be build. Obviously this does not consider the possible return of either or both effects via transfigured gems but i think the point stands still.


As a conclusion, if the goal was to increase accessibility to helmet enchants, this could have been achieved by making the skill gem itself enchantable and not make them scalable via quality. All while (imho) allowing alternate quality and transfigured gems to coexist and offer a massive increase in skill diversity and retain the current balance between skills.
In the same pass, current generic %increased damage enchantments could have been revisited to offer interesting choices and the Labyrinth reward template could have been kept and made drop enchanted skill gems instead of items.

I don't think it's a mistake. Gemcutters used to drop like candy before Heist.

Now it's more efficient to re-level the gem because the drop rate was nerf'd so hard.
It's similar to how they added Tiers to Flask rolls. Only for economical reasoning.
Just looks like more of the same.