I'll say this: Yes, I think that a Christian, who may end up in eternal bliss with the other saints, nonetheless is probably passing up some helpful assists and graces and consolations and the rest if he persists in staying out of communion with the Holy See.
It is as though a member or friend of the family insisted on having his dinner among the garbage cans, with the bad smells and bugs and whatnot. YES he IS being nourished, but he is missing out on the conversation, the beauty, the fellowship, all those things which make a meal an occasion and not merely an ingestion.
IF a child or a friend of mine had insisted on doing that and one day decided to join us at the table where there is light and a fire in the stove (in the winter) and corny jokes told and laughed at for the twentieth time and thoughtful discussion of deep issues, yes, I'd rejoice that he came home.
What a great example of the respect and love Catholics have towards non-Catholic Christians.