Consumer choice doesn't work to affect shit.

For example many people want smaller phones. However manufacturers all decided to make them bigger instead.

To function in society I need a phone, so I either buy one that needs 2 hands to be operated or be an outcast and have major problems having a normal life with no access to banking, communication and so on.

What's wrong with the Unihertz Atom, or the Palm Phone for that matter? They are both solid devices. They're not Samsung or Apple, but that's the point. The large manufacturers decided that you are not their target market, so stop buying from them. There exist smaller manufacturers that supply what you want.