Because if the tank is competent, and I properly balance my cooldowns (for example, countermeasures?), that isn't a problem. And what about Assassins? It's my experience that they have less burst than Operatives do - what's your reasoning there?
Even if you were right, it would still be sloppy design by Bioware. Instead of artificially punishing all stealth classes, maybe they should consider fixing the burst threat problem?
Yes, you do lose DPS. Every second you're not attacking is lost DPS. Even with the speed increase talents, Operatives are still the slowest class to get into melee already. Every other melee class has an effective gap closer - whether it be a charge, or a sprint. Stealth is supposed to be our's. Instead, we have to blow two points in a t5 talent, and blow our vanish in order to get a boost that is still slower than every other class and, because of the way stealth detection is currently set up, we have to start from further back than any other class? That's poor design, and it needs to be changed.