A familiar anecdote told of G. H. Hardy (no relative) who, while giving a lecture, is said to have said “It is obvious that ...” and then paused and left the room for 20 minutes, then returned and resumed: “Yes. It is obvious that ...”.
I point out that this is not a contradiction.
Imagine a large physical structure, such as a building.
There is some one particular vantage point from which you can immediately see that the structure is vulnerable to collapse.
It is valid to say: go there and observe.
The vulnerability is indeed obvious to anyone standing there.
While it may not be obvious where that place is, after it is discovered it is indeed obvious if you merely go there and observe.
I think that this is well within the concept of obvious, at least if getting ‘there’ is not difficult.
This is connected to the phenomenon of trivial but non-evident proofs.
Perhaps we need a short phrase for “it can easily be made evident that”.