While sounding like a cool concept and one that would be fun to try and put into practice, the adept isn’t really set up gain advantages with it’s shade.
It is fun to try and use shade to initiate combat but as far as a core unit goes the adepts sucks and getting a 6s, 60% attack speed increase isn’t going to make it better than a 45% passive attack speed increase.
Right now the upgrade is all or nothing at the moment. You shade onto the opponents army, you either win or you die since it’s entirely committal, and the adept is not a zergling, or a pack of lings. It’s an investment that has to win the shading engagement or it wasn’t worth it because Protoss as a race relies on efficient trades.
Now being entirely all or nothing during engagements is one criticism of the upgrade, the second being all the other times you get a worse off adept in a meta that it’s already not used, but actually trying to use shade to initiate combat and take advantage of the attack boost is impractical.
It’s insanely awkward often giving your opponent a long time to respond to the adepts jumping in, while being to slow to be able to respond to any sort of aggression.
Do you really want to be waiting the shades teleportation delay so that you have a unit that might be able to engage the enemy if your base is being pressured, or responding to harassment, or trying to take advantage of misplay from your opponent?
TL:DR
- It doesn’t make it a core unit that is a viable choice over blink or charge
- The adept is incredibly weaker in all situations except for 6s after shade.
- Trying to use the ability is awkward in all situations besides just an all in jump on the opponents army play, because of the long delay before you can get the attack boost.
The current proposition really doesn’t address the core issues with the adept.