Sadly, middleboxes are a real problem, esp. with our Enterprise customers. We had this problem even with HTTP/2 rollout so there is even a special HTTP/1.1-only mode in the Desktop Client for environments where h2 is disabled.
In the future we are planing on having an HTTP/3 support which will give us pretty much the same benefits as SCTP with a better middlebox compatibility.
In the future we are planing on having an HTTP/3 support which will give us pretty much the same benefits as SCTP with a better middlebox compatibility.