I also have not heard a single excellent argument for Brexit so far - not a single one, and as a well-informed and educated person I've heard many if not all of them. "Plenty of" is too vague to be of any value as a statement, but I also wouldn't agree that there were "plenty of" EU-savvy intellectuals who supported 'Leave', unless you're willing to count people like Boris Johnson to this group. You and the rest of the 'Leave' is being dishonest or simply deluded / misinformed.
Please don't bother discussing this topic with me (or Trump supporters or climate change denial, for what it's worth). I'm sick of it and the UK. What I would like to ask you and your kind is to urge your politicians to exit the EU swiftly and then shut up and never blame the EU for anything that happens to the UK again. Bye!
Had there been a simple test of 10 questions about how the EU works, drawn from 100 previously published questions, that needed to be answered in order to qualify as a voter, then the Brexit would never have happened. Likewise, if there hadn't coincidentally been a bloody civil war in Syria with many refugees looking for a new future at the time of the Brexit, then the Brexit would also never had happened.
Coincidence and lack of knowledge have determined the fate of the UK and Europe as a whole for the next fifty to hundred years or so. But you could say the same about many other historic decisions and events.