Ceterum censeo Carthaginem esse delendam...
You preferance for positive plane is O.K., and anyone may consider it, if his tools support it. The pros and cons must be discussed related to the respective tool. I e.g. don't know the situation with layout plus. I expect, that a professional layout tool, if working with negative planes, can do a complete DRC for it.
Thermal relief on vias hasn't to do with positive or negative planes. I agree, that you normally should't use the option, if your tool has it. I don't remember a situation now, where it had be useful.
For the drill tool display, I suggested actual size rather than a drill symbol drawing. Otherwise it's hard to read.