Simple things like a small question regarding the codebase turns into a video call with a colleague where you first ping them on chat and ask them if they are free and then schedule the call. Even if the whole thing takes 10 minutes, it's too much compared to just turning sideways, asking them something if I was in office.
OTOH, I was much more comfortable working remotely in my previous job where I was already familiar with the code and the job on the whole.