[TheP1000]

Is above still an issue with http2/3?

edit: From the article: To workaround the limitation you have to use HTTP/2 or HTTP/3 with which the browser will only open a single connection per domain and then use multiplexing to run all data through a single connection.

[gorjusborg]

No, if you can enable TLS and HTTP/2|3, you are only technically using a single browser connection, onto which multiple logical connections can be multiplexed.

I think the article calls this out. There is still a limit on the number of logical connections, but it's an order of magnitude larger.