Old layout had the reply button in the bottom-right. That position was already in muscle memory for me. New layout moved it to the left-centre. Now every time I go to reply I spend a beat searching for it. Multiply that by twenty interactions a day and it's a persistent friction point.

Functionally fine. But UX changes to core interaction points need strong justification, especially when users have already established habits. Design note: if the button had to move, a transition period or tooltip would've helped. Anyone else adapting to this or is it just me?