Given the acrobatic and unpredictable nature of a hooked seatrout i have concluded that barbless does not work for seatrout.I'd love to be proved wrong.
Which is why I prefer debarbed rather than barbless. The little bump that is left really helps the hook hold better, especially if the fly hooks into the hard "scissors" of the mouth. The hook still pops out easy when you want it too.
The hook shape also has a bearing on how good a hold it gets. You only have to look at Carp hooks to see how curved shanks have been developed to dig deep and hold well.
Sometimes I have struggled to remove small buzzers from trout when the buzzer has been dressed on a Buzzer/grub type hook.
With long shank hooks the fish has the ability to lever out the hook by using the shank. Wether this is intentional or not does not matter as the result is the same.
Lastly, the shape of the point can have an effect on the hold.
This is the old patern Ad Swier hook, renowned for a great hook hold...
and this is the new version...note the point shape...and this hook has a bad name for fish dropping off...