The question is ultimately "What's the point to execute the algorithm if we have already searched for the element in order to build the oracle?"

Whilst somebody prebuilt the oracle, it may not have been the person using the oracle.

Grover's algorithm requires the oracle be queried no more times than $\sqrt{\text{size of list}}$. Naturally we cannot hope respective database lookups, as proposed earlier against which I cannot comment for lack of reputation, on say 5 million keys will return the content we want if our content is not addressed by any of those 5 million keys, but by say the 9 millionth key, which happens not to be in our sample. How does Grover's algorithm do it then?

We ask the Oracle: what is the answer it already has for the question it already has? Even Mateus and Omar would ask the "Oracle-for-a-particular-alphabet-symbol" during runtime, what are the position(s) of its symbol in the string that it has already compiled? The oracle will give the answer to our query after only one consultation, but in this story, it cannot for example simply write out the answer as a binary string and send it to us over a classical communication channel. It will hide its answer in a superposition for us to draw it out.

I let fancy or metaphor run away in this next bit: we don't quite hear the answer the first time, and we have to ask the oracle to repeat the same answer over and over again until we are sure what the oracle has said, except we start to hallucinate from misinformation in the diffusion process if we ask too many times.

The question is ultimately: "What's the point to execute the algorithm if we have already searched for the element in order to build the oracle?"

Whilst somebody prebuilt the oracle, it may not have been the person using the oracle.

Grover's algorithm requires the oracle be queried no more times than $\sqrt{\text{size of list}}$. Naturally we cannot hope respective database lookups, as proposed earlier against which I cannot comment for lack of reputation, on say 5 million keys will return the content we want if our content is not addressed by any of those 5 million keys, but by saying the 9 millionth key, which happens not to be in our sample. How does Grover's algorithm do it then?

We ask the oracle: what is the answer it already has for the question it already has? Even Mateus and Omar would ask the "oracle-for-a-particular-alphabet-symbol" during runtime, what are the position(s) of its symbol in the string that it has already compiled? The oracle will give the answer to our query after only one consultation, but in this story, it cannot for example simply write out the answer as a binary string and send it to us over a classical communication channel. It will hide its answer in a superposition for us to draw it out.

I let fancy or metaphor run away in this next bit: we don't quite hear the answer the first time, and we have to ask the oracle to repeat the same answer over and over again until we are sure what the oracle has said, except we start to hallucinate from misinformation in the diffusion process if we ask too many times.