Hmm,
I agree with you PoW coins also face the possibility of a history rewrite.
And at this time only a checkpoint from either a rolling type or server type could prevent it from being an issue.

Were you pointing the checkpoint solution out to them in the posts or have you found a different way, if so please elaborate.

Thanks.
 

EDIT:
My Bad,  Thought it was a tech fix , you were suggesting.