So your quote part, What i am saying is, every class and spec can deal with rogue sap and blind capping. There is no “i play x spec or class so i can’t do it”.
Some specs will have it easier than others, but no class in the game is unable to successfully defend a sap blind cap.
As above, there shouldn’t be a situation where you cannot see the flag being capped, it may be harder to see in a smoke bomb but that shouldn’t matter, if you see a smoke bomb you need to run in and deal with it by using anything to break the cap cast.
The rogue will blind you, you trinket, you run away from the flag and only hit the rogue to keep in combat/stop caps, you do NOT need to kill the rogue or fight on the flag, you are merely attempting to distract and disrupt the capture attempts long enough for people to get back to help you defend.
Even with sprint sap should expire before he can cap and any instant damage will break the cap attempt, that’s the entire point of staying away from the flag, to make the rogue waste the sap time having to walk back to the flag to start capping.
The topic of there being 2 rogues is irrelevant to this advice, this advice is only pertinent to defending vs one rogue. You should not be expecting to solo defend vs 2 rogues or 2 of any class, in scenarios of facing vs multiple people your only job is to survive as long as possible while continuing to break any attempts they make to cap the flag while people come to help you defend.
It does not matter if you die in this scenario, if you die to 2 people instantly after calling out an attack then the call is pointless as the base is already lost and now at the mercy of how many people were on their way to defend.
if you die lets say 10-15 seconds after making your call and have managed to break their attempts to cap then you have done your job by stalling them for back up to arrive, those 10-15 seconds can make all the difference.
The goal in defending is not to deal with every single opponent successfully winning every fight, the goal in defending is preventing the enemy player from completing the capture cast at ALL costs.
Again, some classes have it significantly easier than others to deal with rogue caps, but using basics of standing far enough away from the flag that sap is worthless and keeping your trinket for the blind no class is unable to defend that scenario.