The "PvE skill check" likely refers to Flak, but it's not correct to focus on Flak damage just because it's a large damage number. Flak does have the possibility of dealing immense damage and stopping a squadron, but as has been repeated many times it's not something to expect or bet on. Personally, I think of Flak as a Critical Hit mechanic akin to each Flak puff providing a 1% chance of providing a large amount of damage, so 10 flak might equate to a ~10% chance of occurrence as an easy short-hand expectation.
Continuous Damage stacks multiplicatively. A Cruiser that has no DFAA, no flags, no skills, no upgrades can at most reach 150% output. A Cruiser that has DFAA, Flag, Skills, and a Slot 6 Upgrade for "all-in commitment" reaches up to 380% output. It's a 2.5 fold increase even without Flak ever touching an enemy plane.
Given the above range, if attacking an unspec'd Cruiser that costs 1.5 planes to strike there's an expectation of being struck twice while the CV loses 3 planes. With a full spec (for comparison's sake), the CV would lose ~4 planes on the first attack and would not be able to continue even if it wanted to (which it would not). After that interaction, the Cruiser would expect the CV to shift focus and hope its teammates were able to deal with you because it would have a series of bad trades if trying to continue interacting with you (or a teammate you choose to positionally block for).
If the Cruiser chose to take a much less invested 2 point talent for Priority Sector and DFAA, and used an AA flag because why not, the output would rise from the base 150% peak to 275%, which is an 83% increase in Continuous... again not worrying about Flak connecting. That too is enough for a 1.5 plane cost expectation to shift to a nearly 3 plane cost, which removes follow up strike capability and alters the trade expectation from the CV.
Then for easy-math's sake, if only 1% of CV players have a realistic expectation of taking no Flak damage at all over the course of several matches... then it means that 99% of CV players do not have that expectation.
If it remains relevant against 99% of the playerbase, especially when it's quad-damage buffed during DFAA, then it's not something to be removed from consideration when discussing DFAA's value.