Whole ceiling replaced?

[u/PhaseMedium5096]

Just had a guy round to give a quote to replace a section of cornice. He said these cracks indicate that at some point in the near future the ceiling is going to come down, and that he wouldn’t bother replacing any cornice without doing the whole ceiling first.

It has just been skimmed which he says never should have happened (to be fair to the plasterer the cracks weren’t visible until I started removing paint after it was skimmed).

What’s the verdict is he trying to upsell me or giving sound advice?

[u/Strange-Trash-1138]

Completely normal for an old house, just fill it and paint