Mind blasts cooldown on alpha is 1/3 of a GCD longer for no reason at all, meaning it doesn’t even line up with the rest of your rotation outside of voidform anymore.
In voidform, mind blast still comes off cooldown in the same GCD as void bolt, leaving it unused while void bolt takes priority. This has precedent for being a problem blizzard fix on both fury warrior and BM hunter during BFA alpha, yet shadow still requires a talent.
That’s one very small example that I’m sure you can substantiate by checking alpha spell data, and messing about for 5 minutes on a dummy on live.
Shadow Word: Death, while it has returned. Is currently set to deal upwards of 40% max hp to you in raid gear when it’s used on a target sub 20% and doesn’t kill it. Something that’s gonna happen a lot in raid encounters where the spell makes sense to increase our execute damage.
Power infusion is now usable on allies, meaning despite the spec being tuned around using it on yourself, you’ll never get to, because it’s always better to use it on another DPS with actual cooldowns to use with it.
Shadows legendaries are uninspired or don’t amount to things that make any sense for us to actually be doing, comparing them to other DPS legendaries is legitimately annoying.
Shadows covenant abilities range from pure utility, to a damage cooldown that replaces mind flay with a cooldown ability, meaning your rotation just has gaps in it where you can no longer mind flay. The venthyr one also only generates insanity when your target deals damage, meaning if your tank dodges or parries the mob it does nothing.
The list goes on, and on, and on, and I haven’t even talked about how it feels to actually play on alpha.