For some reason, those two Celine copies don't bother me.
Most designers pull from vintage. They'll do inspiration shopping trips, library and museum visits, etc. It's extremely common. Sometimes only details and ideas are lifted from all the research - sometimes things are literally copied.
When someone like Marc Jacobs or Phoebe Philo makes direct copies like this, it always feels like even though it's a literal replication they're somehow recontextualizing the piece and making into something that looks and feels like their work. They have strong enough voices/points of view that are unique and individual. Also - it's not like the entire collection was a copy. It's one look/one piece. I don't feel like these examples reflect negatively on their creativity. Some of the greatest songs in history have used samples from other songs. They've directly taken one particular loop or chorus from another song and integrated it into an entirely new creation. Think of it like that.
It feels different for me when someone like Joseph Altuzarra copies. Because while there usually isn't any direct copying going on of any one particular item of clothing, the whole idea of the collection and the look of the collection and the styling of the collection tends to always be lifted from someone else's past collection. It's almost as if he wishes he had created those older collections himself because he loves them so much and so he sort of remakes it (think of his Fall/Winter 2010 that was essentially a remake of the entire Gucci Fall/Winter 2003 collection). He, to me, has no clear voice as a designer and I find his version of copying far more offensive.