Buying such tiny screen phones at this point of time would just limit the productivity as an when needed, if that's all one needed they could dig up their 10 year old android device with 2.5" screen or better buy a current feature phone with 4G and 30 days standby time for fraction of the price.
IMO, If a new smartphone manufacturer wants to enter the space with the premise of 'improving lifestyle', then perhaps they should build devices for pure Linux smartphone OS like these[1][2] where productivity is available when needed via web apps, supposed lifestyle culprit apps aren't available anyways and help build a better ecosystem.
[1]https://store.pine64.org/product/pinephone-community-edition...
[2]https://postmarketos.org/blog/2020/06/15/pinephone-postmarke...