That 30% loss percentage- the majority of it is going to be non-games. When you have a really good matchup- what's the upper bound on your win %? It's not 100. It's usually 75-80%.
Mirror that, and suddenly, you realize a significant number of games are already over before they start. The goal is then fighting over that middle 40-60% of winnable games. The reason you "feel" the amount is higher is because you spend way more time in the real games, because the non-games are over fast.
edit: For an example of this- look at the way winrates crater in limited play the moment you mulligan.
Mirror that, and suddenly, you realize a significant number of games are already over before they start. The goal is then fighting over that middle 40-60% of winnable games. The reason you "feel" the amount is higher is because you spend way more time in the real games, because the non-games are over fast.
edit: For an example of this- look at the way winrates crater in limited play the moment you mulligan.