Im talking about what is possible. Space suit technology is based on necessity and budget. Low earth orbit doesnt require space suits that can withstand those temps that is why they arent designed for deep space temps. Its not because its an impossibility. There is nothing stopping us from designing space suits that can withstand those temps.
Heat transfer is much slower in vaccum. The cold isnt the issue. Insulation and temperature maintenace isnt some insurmountable obstacle. Worst case scenario we could only do short EVA's. The problem is pressurization and we have that figued out. Another problem is radiation. And NASA and independent companies are already working on ways of protecting manned missions beyond the protection of our magnetosphere.
I find it funny that you think current space suits are the absoldute limit. Thats like believing this thing...
...is the absolute limit of diving technology. Between the resistance of the human body, our ingenuity, our intelligence, and our unwillingness to throw our hands in the air and quit, its very likely that space suits will go far beyond the current ones we have.