I apologise, I didn't see the striking bit.
I agree and I never recast liners but if the bobbin moves up without returning to its original position or drops down then odds are you've been done and the lead has moved.
After watching underwater footage of fish picking rigs up and leaving them in a way that they aren't effective and without a single indication at the rod end has left me paranoid.
as for the "kiss of death" on recasts over feeding fish then that's something you'd have to weigh up the pros and cons, The places ive fished it doesn't seem to bother them.