Absolutely. Hormones and surgery don't make it as if you were born the opposite sex, and they never will. For example many transwomen are tall with manly bone structure etc.

Yes, relationships should be based on honesty not lies.

No matter how good its done.You'll know

Yes, because if they were born the opposite sex then who knows in what fundamental ways they still are the opposite sex. Not being able to tell doesn't mean everything. The only way that it really wouldn't matter is if you completely rewrote their identity from the atomic level (and, to be truthful, probably their spirit too), in which case you might as well have destroyed them and made another human in their place. And even if you did that I don't trust a human that was completely invented by technology as far as their dateability goes.

These people must suffer to be okay with that kind of surgery. The body doesn't want it though and is also fighting against it after the surgery is done. It is an extreme sacrifice.

You live in fear a trans girl might seduce u and you'll feel gay when finding out?

If you can't tell it shouldn't matter.