That's what HPACK (which is described in the article) and it's dynamic header table is for. However as soon as you exceed a certain amount of headers (the size

That's what HPACK (which is described in the article) and it's dynamic header table is for. However as soon as you exceed a certain amount of headers (the size which you can store in the dynamic table - typically 4kB) the header table might no longer work as good as possible. That's because the newer headers will always lead to the eviction of older headers in the table, and therefore headers will no longer be cached for the duration of the connection.