I use chromium to browse bitcointalk on mobile and it works fine for me whenever I feel it's difficult to read I use the zoom-in and zoom-out features and it makes sense too because the screen is smaller in size on smartphones compared to desktops along with there is no bitcointalk version available to optimize the site according to your device specs.

You can use the landscape mode to get better coverage but I am not comfortable with it so I use zoom alone but my suggestion is you will get used to it once you have become familiar with bitcointalk.