For food, chem or even weapon buffs like TTDS, for the buff UI, i feel it should tell you how much time is remaining for the buff to expire out, it would help a great deal

They could add a circular gauge around it or something. However, some buffs get grouped up into one if they're the same type so maybe having individual timers for each buff would make the UI cluttered. I don't think it's a problem as someone who plays on PC, but I imagine it being annoying and distracting for mobile users. Maybe a toggle option would work?