let me just preface this by saying that this question stems from my lack of knowledge about others' opinions regarding this matter, so the only prior knowledge I have is my own preferences.
So, I use dark mode everywhere; every single website is dark for me (using Dark Reader) and every single software I use is in dark mode. If it doesn't have dark mode or at least low brightness colors, I can't use it, even if the sun is directly above my screen.
And so I wonder sometimes why do light themes even exist. I have only seen them IRL for projector use (e.g. schools) or in formal demonstrations because for some reason they're regarded as more "professional" maybe? Plus, I always read people complaints about no dark mode in so many applications but have never heard someone complain about some application not having light mode.
So my question is: is it okay to simply have dark mode and no light mode? Are there any benefits of having light mode? Or any data showing how many people actually use light mode?
(Addendum: After some googling, Discord removed light theme because almost nobody uses it. Is this some very specific case or can it be generalized to almost everything else?)