Weighing the "I've never ever-heard-of-the-suggested-explanations" with against the "throw accusations against Q against the wall and see what sticks".
The biggest answer you know, is that there are very specific photographs by Q which could only have come from someone in President Trumps' immediate circle; in particular a couple aboard Air Force One, and a couple from the advance team for the meeting with Kim Jong Un, *before* the itinerary was known.
The other thing, particularly, about the 4chan/8chan authentication, was that at an early point in 4-chan, some anti-Q gibberish got posted; Q's first response was not to ridicule or defend -- but to seek if the person was really CodeMonkey. Upon NOT receiving a satisfactory answer, Q's ONLY response was: "Board compromised. I will not post ANYTHING to this board anymore, my silence with prove I am the only one with rights to post and that I am concerned with security."
Nobody purporting to be Q ever posted on 4chan after that.
The emphasis on OPSEC immediately, and OPSEC *only*! -- is what showed Q to be genuine.
There are other proofs, but those are the ones which were enough for me.
Good proofs! There is enough clear evidence to prove that Q is geniuine, provided a person wants to know the truth.