For you, sure. So are you 10% of SE demand? 30%? 70%? We don’t know—but Apple does. And for a significant number of users, their phone is their only computer. They do not want a 4.0” screen; on the contrary, the bigger the better.
Sure, some like the SE because of size, but even if you combine both groups (price and size) it still doesn’t add up to a sufficiently large demand to warrant being manufactured. It’s no different in the Android world.
People who like the SE never like to hear that, but that’s the reality. If there were enough demand, on the iOS or Android platform, one of the dozens and dozens of phone manufacturers would make them. But they simply don’t/won’t sell well enough to be profitable. You can’t always get what you want, even when you’re willing to pay for it.