i don’t get the “obi-wan should never refer to R2 by name”. honestly, it doesn’t change anything, because they’re still in the very same room and Anakin calls him by his name so… it just seems a bit pointless to me.
It’s a very small thing, for sure. I think the novelization of ROTS characterizes Obi-Wan’s attitude toward R2 and droids in general as somewhat dismissive in order to try harmonizing things with ANH. Probably also building on his comments about droids in AOTC.