For longer rougher rides, the movement from gel causes more hand fatigue than a flexible bar. It causes the fingers, palm to move. Long real bumpy rides it may create blisters, while thin tape, flex bar will not.
A flexible carbon bar has give, but the hand/bar relationship stays the same.

The Fizik pads stick quite solidly to the bare bar tubing , they have a release sheet covering them until applied.

There may still be a need for an assplosion sub-forum.

My son used the Fizik for Paris Roubaix juniors (same cobbles as the pros, without the 100 miles pavement warm-up) and had blisters for days/week later.
Later went to thin tape on cobbles, flexible bar and no more issues.

didnt wear gloves?

Yes, that time. He was taped up with wrist braces. That may have been a factor too.

Later setup no gloves, thin tape, carbon bars - no problems.