Correct. Very few cars can be liive mapped now unless you are the OEM,
However, it isn't really needed in the same way as old ECU's. There are hundreds of internal variables that need to be monitored nowadays. They are changing very quickly so the only way to know what is going is to datalog. You then study the results, make changes, and datalog again.
Some semi modern ECU's can still be live mapped but there complexity again means it isn't that useful apart from perhaps initial MAF or injector calibration. It certainly isn't any use when I'm at Brunters doing 180mph!
Rick