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That hasn't been my experience at large corporations. They usually have a corporate proxy which only speaks HTTP 1.1, intercepts all HTTPS, and doesn't support websockets (unless you ask for an exception) and other more modern HTTP features.

"tamper" sounds much more involved than what they (their implementation) probably do: the proxy decodes the http request, potentially modifies it, and uses the decoded form to send a new request using their client, which only speaks http/1

That is already tampering with the request. It's not simply forwarded to the requested destination, but intercepted, interpreted, and resent... with a different client than the original source.

That’s exactly what they’re doing and it’s still very common in private networks