fq_codel alone doesn't solve buffer bloat. There are still huge buffers upstream. You need to combine it with local rate limiting so you can control the buffer in your local home router. fq_codel/cake work by looking at time a packet spent in a local queue. If you don't rate limit locally, then your local queue is always empty and everything queues upstream. Modern routers with things like "Dynamic QOS" that use fq_codel all require providing downstream/upstream values. This is way simpler than more traditional qos, but it's still a barrier to wide spread adoption.
