I want to add that why I am not completely convinced that it is better for the letters to have serifs, I definitely believe that the letters drawn with constant-width lines are much uglier than the letters drawn with variable-width lines.
Because of that, even if I use frequently sans-serif typefaces, I use only non-traditional sans-serif typefaces with variable-width lines, e.g. Optima Nova, Palatino Sans or Trajan Sans.
However, such typefaces with variable-width lines also need high-resolution displays to be useful. On displays with less than 4k resolution, their appearance at normal text sizes is degraded.
Because of that, even if I use frequently sans-serif typefaces, I use only non-traditional sans-serif typefaces with variable-width lines, e.g. Optima Nova, Palatino Sans or Trajan Sans.
However, such typefaces with variable-width lines also need high-resolution displays to be useful. On displays with less than 4k resolution, their appearance at normal text sizes is degraded.