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I am far from an expert but from what I understand a HTTP/2 site with HTTP 1.1 'hacks' for performance will:

Run slower than the same site with the HTTP 1.1 'hacks' removed

Run faster than the same site serving via HTTP 1.1.

In most cases.

Right, the practices are 'harmful' in an HTTP/2 world, meaning, in that world, these practices harm you rather than help you. You are correct in assuming that your site and its resources would still load faster in HTTP/2.

As a follow up question, has anyone thought / worked through support both HTTP/1.1 and HTTP/2 simultaneously?