It's interesting that I agree with the article that you linked?

I'm not contesting that it's completely possible to hit the limits in play, but 16k connections (per IP) is high enough that I don't think that's a common problem, even in public-facing web services. Granted, I suspect the services I've run professionally all dealt with it by making it the problem of a load balancer in front of the application and internal network, but... you probably have that anyways, so I'm still not seeing the problem.

it’s interesting because I think youve internalised the constraint and built mechanisms around it rather than engaging directly with it, subconsciously.