There is a lot more to how online games work, that is why a starting Competitive Penalty is very small. See this topic for details:
Right now, the new current problem (after Drakuloth sign off) seems to be network hub related. So this not really on Blizzard, nor is it on the end users, but something between. Again this might be something Blizzard can work on but right now it is more important for players to avoid Competitive if they are disconnecting frequently.