'equipment manufacturers - of both transponders and radar processors - soon started building in what are often called 'slugs', slight delays before believing that a changed code really was the next selected code and transponders effectively switched themselves to STBY while code selections changed'
Was that rubbish, then ?
Not rubbish, but not to be relied upon as universally applicable - there will be old equipment out there and few people using radars will fully understand what processing goes on behind the screens. Just as posts in this thread show that many pilots are not fully aware of how their equipment works.
But as one of my old instructors used to say, it's always a good day when you learn something new.....especially if no one gets killed.