SE has nothing to do with the infrastructure and network policies put in place by the long list of universities, governments, and private ISP's that have built the massive web of networks over the last 50-60 years. That is all managed by those respective entities. SE can really only reasonably be expected to directly address issues linked to things on their end or their ISP's end after we get handed off into those networks. That would be the last 3 or 4 hops in most cases. Everything else branches out from your devices, to your ISP's devices, then their partner's devices, and so on until it gets to Ormuco, who is SE's ISP.
This has been going on for decades... and for decades the ISP's have gotten away with shoddy maintenance on their networks and agreements with all those involved in providing interconnectivity between the disparate networks that make up the internet. Because their subscribers have been none the wiser about what is going on... they don't understand where the problems stem from, and have continually blamed the wrong people. And the ones actually responsible have been laughing all the way to the bank. For example, back in the fall I managed to track down some details about our CMTS here, and the hardware was from around 2001 and not even DOCSIS 2.0 compliant---but they were pushing 3.0 level plans that required 8 channel DS bonding on hardware that only supported up to 6 but was only giving out 4--and then they started pushing towards the new 3.1 standard that puts even more channels into play. I made a big stink about it through their forums and support chain, and suddenly I was taken off that gateway and sent to an entirely different city all-together and my latency was reduced by nearly half.
So... yes. If you want your internet issues to get cleaned up, you need to lean on your ISP. They are the ones that dictate where your packets get handed off to on the way to their destination. It's not Microsoft, Blizzard, or SE... but your ISP's routing/peering/transit policies manipulating your path to those endpoints.