As an organization, we like to compare things. Symbols, allegories, stories, etc.
When I think of the EA, I remember my days in the Navy's nuclear power program. To qualify as a reactor operator on a ship, it took about a year. Before you qualified that position (with exams, oral boards, etc), you were not allowed to perform maintenance on equipment in the power plant. Neither could you stand watch on the actual reactor.
You were a NUB (non-useful body)!
There were two kinds of nubs: the kind that still found ways to be helpful and the kind that didn't.
The good nubs couldn't do maintenance, but still showed up to be go-fers, to learn, and generally tried to take one responsibilities open to them. The other nubs would try to avoid work, saying that "my studies should come first."
We're smart men. We initiate smart men. If a gentleman is brought into the Craft, and wishes to assist the Lodge, I say he should be able to do so, if only in a minor role. I find it extreme to suppose that if a man is a member of a committee, he will be completely unable to learn his memory work. I would just remind the brother that he cannot have his name published in any way associated with the Lodge, so his work will go mostly unpublished until he is an MM. He might be the cat's meow in his given field, but he can't be an official "member" or chair of the committee until he's an MM.
The impetus is still there for him to pursue his memory work. I still believe getting someone involved, via committees, is the next natural step. I'm sure brothers from 100 years ago would be blown away that EA's can attend meetings now!