I can see that, yes. But if I don't go Streetfighter I'll just go straight rogue. I have a good idea what I want to play, it's just a matter of whether Streetfighter will help or hurt it.
I do not understand why some people are answering outside of your question.
With the build you seem to have in mind, I strongly recommend devoted/streetfighter over devoted/rogue.
The passive will help a ton in most cases, and only slightly hurt (20% is not much) in easy battles where it's ok to be slightly less efficient.
I hesitated a long time about playing a build very similar to yours, because I enjoy single sword/no-offhand.
I am convinced that it will work well in Veteran (can't tell about PotD since i didn't play it yet). Ultimately the only reason that took me away from it was that I did not want to multiclass so I played a pure streetfighter with rapier and dagger.
As long as you get decent con/res (about 14) and pick some defensive abilities from the fighter, you will be fine in the melee. Get persistent distraction, this is really good on any melee rogue and will give you more relative tankiness and more crits.
As I said before, because people are freaking out about you not dual wielding: You can focus on abilities that do not apply full attacks.
Use conqueror stance. This has a good synergy with streetfighter as you become more durable when bloodied.
Use Sap . Sap is a primary attack so you are not loosing anything by not dual wielding. But honestly the others would still work fine if they appeal to you.
I'm going a bit off topic but I'd be happy to discuss your build idea