Yes, exactly.
This is why PvP Rogues have never been fond of Shadow Techniques. If you are Stealthed after a Vanish and closing in for the re-opener, or if you get stunned or rooted, your baseline income of resources (both energy and combo points) drops. It feels terrible to play this way. Also the Variance introduced by the "3rd attack has a 50% chance to proc it" business is annoying for Subtlety which has historically been a very low variance spec in its rotation. Yet another instance where the actual gameplay is being homogenized towards other classes/specs while Blizzard claims "look at the flashy animations and purple particles, Subtlety is more unique than ever before!!"
For these reasons, ShT should be rolled back to HAT and Energetic Recovery.
For similar reasons, Premeditation should return. Players that enjoy the First Dance trait can simply macro it to mimic that behavior when Premed is available but more importantly it gives us 2cp from Stealth before we open so that SnD can already be rolling when you leave Stealth. One of the most unique Subtlety mechanics ever, also lost in the great prune.
Symbols of Deaths should be completely removed because it's a terrible, low interactivity, flat % dmg increase - and that will free up the necessary bind space for Premeditation. The history of Symbols of Death is a complicated one that involves Blizzard trying to fill a void that was left after they initially removed Find Weakness, Slice and Dice, and Premeditation (in its various versions that have been tried, it's attempted to replace aspects of each of those abilities) but it's time to face the fact that this ability just isn't working. It's not built on a strong foundation of Rogue identity to begin with, and the gameplay was better before which Blizzard obviously realizes because both Find Weakness and Slice and Dice are returning. Complete the job: delete SoD and bring back Premed.
There is also the major concern of Find Weakness being still the weak 30% form (vs. 70-100% before it got pruned in the first place) and randomly procing from Backstab and Fan of Knives (my Rogue uses Knives, not Shurikens, sorry). This completely defeats the purpose of the ability and provides unfortunate evidence that Blizzard didn't truly understand the feedback to bring back Find Weakness in the first place. First of all, this rotational variance feels horrible for Subtlety which for most of its history has had a high level of determinism. Secondly, this high FW uptime build runs directly counter to the stated goal of making Dance burstier and available less often. Because FW can't possibly be tuned the way it should to give bursty Dances and openers from Stealth when it's also up constantly, they are really backdooring the same steady damage profile onto us, we just get to press Shadow Dance less often.
Finally, Gouge. Gouge was pruned because, and I quote Celestalon directly from 2015/2016, "we're giving you more CC with more Shadow Dances so we're taking some things away to compensate." WELL? We're giving back the dumb Shadow Dance charges which we never wanted. Bring back Gouge now. There is no excuse anymore, and their complete refusal to even discuss this ability indicates a large degree of dishonesty where they won't even openly state what their hangups are.
Subtlety was essentially a superior spec in every way prior to Legion and we are going on the 3rd expansion in a row now where they can't even get it back to that level.