The gif is from HeroicMass and it's on console. You said yourself that the console controls are hardly optimal and once he threw that hidden blade, he was already done for. It is really annoying that attacks that you could normally tank without a problem (on a guard character like Pala) can randomly do insane damage and one-shot you.
It's like the no-scope instakill move that the Archer used to have. Sometimes I would use Flank Attack on them and initiate the runaway and still get hit while sidestrafe sprinting in stealth. Bioware fixed the damage for that attack, but I don't have much faith that they'll fix this. After all we have complained about Fire Wraiths doing triple damage ticks back when we only had Perilous and the only thing that has changed is that they can now do quintruple damage ticks and that the mages and spellbinders have started to imitate them.
Working as intended I guess.
To be fair, I'm pretty sure it is a small team doing the fixes, and some things do take time or take priority. Would you rather have this fixed or new content... I know we'd rather have both but being realistic means projects need to be managed.
Oh yeah the instagib rolling draw move. There were definitely ways around it.. but I had to adapt my playstyle around it. I learned not to use FA anymore for instance, especially not against archers since damage is what triggered the move just as you stated. All enemies try to finish their animation unless interrupted by an outside condition too, so they remain targetted on you. I don't stealth until after those attacks are finished. Granted today's fade stealth is pretty OP, and that isn't necessary anymore but ugh... that made archers so painful. Current players don't understand the pain.
Now those glyph mages.
he was already done for
He was actually done for before he even engaged because he wasn't paying attention at all (given how fast he was using skills in sequence) and didn't have any abilities to counter it (combat rolling away for one, saving CB cooldown for escape for another, etc etc etc). In the process there were several steps where he could've done something else, and cues that it was coming. Spellbinder turning to target him, the hand wave, the glyph, the 1-2 seconds before glyph actually activates.
By the time he saw it, he already committed and reacted too late. If he changed his order it and targetting, it would've been a completely other story. CB steamroll the mage would've kept it knocked down and prevented casts, hidden blades first instead of TB to ensure it actually dies instead of being triggered and aggro'ed on him, watching the target's animation, leaving time in between skills to evalulate and jump or sprint out of the way. All of these are options.
Whether he learns from the experience is the mark of good player or not. Just saying oh this is too OP doesn't really help. Sure if everyone doesn't like it, fine the devs will likely change it just like the archer nerf and the shadow nerf (they're still deadly just not so deadly as before). . . but some of the fun comes from adapting to and overcoming challenges like this.
Note: I've died a LOT to glyphs. Less now for many reasons obviously, but enough to spot all those cues and change my playstyle to win. I miss out out on the funny gifs though.