Is "of" needed here?

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The sentence I'd like to ask wasn't completed!

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I'd like to know whether "of" is needed in the sentence(before "major concern") below and if so, the meaning of it...
Could you help me??

The finding that a cup of tea tastes better if the tea is poured

I would also like to know that if I can say like:

1) The finding ... has been a major concern to this nation of tea drinkers.

2) The finding ... has been one of major concerns to this nation of tea drinkers.

Thank you very much!

H Man argument that has been "of" major concern

of is required. Here concern is a non-count noun.

For more on "to be of", see

CJ

H M-
1) The finding ... has been a major concern to this nation of tea drinkers.
2) The finding ... has been one of the major concerns to this nation of tea drinkers.

You can also use these (as shown). Here concern is a count noun meaning 'a matter of concern', i.e., 'a matter that causes concern'.

C