Frustrating with Actors/Actresses change

Hey, don't you guys find it frustrating when showmakers repeatedly change their actors/actresses?? Like for example, the greatest example in our eyes is DMG- with the three Riddhimas and now the rumours doing rounds that she might change again. I hope not, becuz, you get so used to looking at the character from that specific actor's point of view that all of a sudden when they change its hard to accept the character in a different form. I think actor/actresses become the identity for their characters and I find it extremely disappointing when they change! I hope they don't change Jennifer Winget's role. I don't understand why some people seem to hate her and Sid. Come on guys they are just actors merely doing their job as the CRV's tell them. Another actor would have done the same thing as required by the script. I don't find it appropriate to hate the actors/actresses themselves but, blame the story if you don't agree. What you say guys?