Oh, you think Trump is stupid. I actually don't think he is. But hey, if you want to think he is stupid, be my guest.
So, apparently you'd only believe in a quid-pro-quo if Trump were stupid enough to say in all words, in a call with lots of officials listening, "hey, here is a quid-pro-quo, Zelensky. I need to win re-election. It will be a personal objective of mine to win, and I have this pesky opponent, Joe Biden. So, I need you to help me. I need you to announce a bogus investigation on Biden so that he appears corrupt and loses points with the electorate, and I get my personal gain of winning re-election. I will NOT give you any aid or sell you any missiles if you don't accept my quid-pro-quo, but if you do help me, I will send you the aid and sell you the missiles."
I mean, who do you think you're fooling?
I read an analogy here, published by another poster, I think it was Cardinal. I don't have the link and I paraphrase, but it went a bit like this:
A businessman comes to see a politician. He says "I need this business permit and it is stalled. Can you help?" The politician then says "Oh well, I might help, if only I had enough time to look into these matters. You know, I am very busy running for re-election and my campaign needs funds, so I get busy fund-raising. But say, if by any chance, some businessman walked into my office and said, hey, here is a check of $200,000 for your campaign, well, I'd be immediately less busy with fund-raising and I'd have more time to look into your business permit; might actually be able to issue it."
So, the politician didn't say "here's a quid-pro-quo, you give me $200,000 for my re-election, and in exchange for it, I give you your business permit."
But are you seriously thinking that with the disguised phrasing two paragraphs above, this politician is NOT guilty of an illegal quid-pro-quo???? Are you actually THIS naive?
Of course Trump wouldn't mention the personal gain in all words... but it doesn't make it any less clear that he pressured Zelensky into a bogus investigation to smear a political opponent in his own re-election bid, that is, for personal gain.