It appears from the wording in the spell that 2 people outside the cloud and on opposite sides of it can see through it without concealment.
"You call forth a cloud of mist. All creatures within the mist become concealed, and all creatures outside the mist become concealed to creatures within it."
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I think DMs and players alike need to use basic logic. If your line of sight passes through the mist, it seems only natural that your view of the other side should be obscured.
Do we actually need special wording to deal with such a situation? Do wall spells also need such wording?
I wouldn't say special wording.
I would say that spells need to state their effects, as by design they're exception based: they do what's stated and nothing else.
Waterbreathing, for example, doesn't give you gills and prevent you from breathing air, but I could easily see a version that does exactly that. And a player or DM who might think that sort of trade off is necessary to how they conceptualize magic.
'Basic logic' as you put it, isn't a factor here. Supernatural game mechanics explicitly don't play by logical rules.