Using as

Yes, correct.

Well, I have certainly heard that, but if you stop to think about it, how can you compare them? They're apples and oranges. If I were doing it, I would think of another expression.

Mister Micawberbut if you stop to think about it

I wouldn’t. I consider it a very natural way to express the parallelism or comparability between two qualities—that one is not notably disproportionate to the other.

Inconsistently, perhaps, I would raise an eyebrow at His speed is equal to his strength.

Mister MicawberWell, I have certainly heard that, but if you stop to think about it, how can you compare them? They're apples and oranges. If I were doing it, I would think of another expression.

I feel the same. Would this be more convincing:

He is as much fast as he is strong.

Oops! I think that is not so good. What I think is that I would just write or say 'He is very fast and very strong'.

Thank you all.