> You're skipping n = 1 and jumping straight to k. How did modern Shenzen become what it is? Through specific reasons like infrastructure investment, or because it was always a 'manufacturing cluster'? By your logic Shenzen must have been the manufacturing hub of the world since before the dawn of time... since it's 'impossible for any place to become Shenzen'.

Sure, any region in a rapidly developing and very dense country, with a large preexisting financial hub nearby, 50 years ago, could have become Shenzen. There was only one of those, and consequently there is only one Shenzen. How far back do you want me to go? Should I discuss the agglomeration effects enjoyed by the Han Dynasty?

> Because the only way to meet and communicate in 2025 is in person?

Why don't you try using that logic on someone you're convincing to give you a large sum of money and report back? The real world does not work this way, and that is why there is still only one Silicon Valley. I've made this point several times now and can point to the status quo to back it up.

> All of these are better remote/digitally in most cases.

I work partially remote. I intentionally schedule my meetings in person because I find that to be significantly better than a video call. I am definitely not alone, and for startups it is even more advantageous to physically be in the same room as the entire rest of the company.