Confidence is key, keep it up.
Here’s the thing people never take into account regarding downed state. It’s a group mechanic. In a 1v1, if you go down and the other guy doesn’t, you’re not supposed to have much more than a snowball’s chance in hell of getting back up.
But, you might say, we’re talking about WvW. That’s where the team comes in. And that’s where there’s no simple answer. On one hand, thieves are always being accused of being useless to zergs. On the other, here they have an excellent contribution to the zerg, finishing off enemy players. Perhaps you should adapt to the game and start making friendly with your server’s thieves, and incorporate them into your play. If you go up against a server who has a lot of these stealth stompers, perhaps you should adapt and start aiming for the thieves. They’re squishy anyway, they’ll make good rally bate.
But at the end of the day, my biggest argument is this. We’re on the WvW forums, so I’ll assume we’re chiefly concerned with WvW. Even if a thief is stealthed it still takes the full ~3 seconds to stomp (barring use of Haste, which isn’t terribly popular these days, thanks to what we used to kitten about thieves being OP for). How often do you survive those ~3 seconds without any other problems? Take thieves out of WvW entirely, and how much more often do you think you’ll get a rally? If there were no stealth, would you be here kittening about stability stomps simply because they’re the biggest barrier to you getting back up?
Each class has strengths and weaknesses. Most classes can do several things well. Thieves generally do one thing well: make people die quickly. Stealth stomping seems to fall in line with that philosophy nicely, don’t you think?
The possibility of physical and mental collapse is now very real.
No sympathy for the Devil, keep that in mind.
Buy the ticket, take the ride.